Hi I'm Cheri. I have only had goldfish for about a year. I have three 2" fantails in 30gallons, two 1/2 " fantails and a 1" Black Moor in 10gallons, and three 4-5" Orandas in 50gallons. I would very much like to combine them in a large custom tank. Can these fish live together? Two of the fantails are very athletic and everyone else is about the same.
What size tank would be appropriate? I have read that it's 2 gallons for every inch of fish...but I'm unsure how big they will all grow. I would like it to be very spacious and have plenty of room for another addition. Also should the new tank have more floor space or more depth?
Thanks!
 Cheri
Mom to Rowan,Elder,Aspen,Ash,Willow,Blackthorn,Hazel,Maple and Holly

Ireiden is right...your fish are all fancy goldfish and should co-exist quite nicely in a 90 gallon tank. The black moor is smaller than the orandas, so I would make sure s/he could compete fairly well, which most can, if they learn where the food source comes from and isn't picked on too much for being sight impaired. And a tank that is longer and less deep is preferable to a tank that is not as long but higher. 

Too big tank? Never. Always the bigger the better! (Btw, I have an 80 gallon tank, doesn't feel that big once the goldies are in there)
Now, be careful with the moors, I've been less lucky keeping those with my fantails and orandas :/ So keep a close eye on them, are they getting food? Are they acting healthy? Do they know where the food is?
If any of these aren't right, you should definitely move the moors to a separate tank. They're a bit slower than the other varieties because of their bad sight, so it might be safer to keep them on their own together to make sure they all get their share!

If you want, there's nothing at all stopping you from putting at least the 2" fantails and the bigger orandas together right away Of course, considering the cycle, if you're going to cycle completely without the fish, you need to be careful and add maybe 2 fish a week to the tank to be sure to avoid an ammonia spike.

Lovely idea, really, please keep us updated and post pictures!

Yes, some moors have better eyesight than others depending on the size/shape of their eyes. If yours is "smart" it should probably make it, but be wary of putting a tiny, blind-as-a-bat moor in with larger, "smarter" fish. Great idea, and btw goldies LOVE their room...like giving them an indoor pond. 

No problem
About the moor, it depends on how long you've had him! Could be that he's just not figured out from where the food actually comes yet, but I was feeding my moor with sinking pellets for a long time Then I introduced one of the fantails to his quarantine tank, and then he started following her to the food. But if you already have fish he could follow in the tank, I'm not sure really.
Feeding sinking food is only safer for goldfish, really! Do you feed them shelled peas? Maybe you could cut some smaller pieces that he could eat from the bottom?

Before I had my pleco, I used to toss in a pellet ever once in a while, watching the fish go nuts about it So, algae based foods are really good, indeed. You could always try and see if he'll get anything out of it But I'd keep trying with the peas, or maybe chopped spinach? The more variety, the better! Buy some different kinds of pellets for staple food too, it'll only make them happy I currently feed mine with 6 different kinds of pellets xD I don't want to feed the same food during one or even two days! Get something with extra protein too, very good for growing goldfish I feed mine a load of blood worms and tubifex along with that to make sure they get as much nutrition as needed c:

I don't know about the "bright" fantails xD In my experience, they're just a lot more greedy than the moors, and the orandas is another step above the fantails... By the looks of it, the smallest fish I have in my tank is roughly 1.5" and she's the first fish in the feeding corner... being a little oranda. But as long as you watch the moor and make sure he gets enough food and that he grows well, everything should be okay

I have two young orandas, one that is pretty small..I take frozen peas, defrost 2 of them and then squeeze them out of their shells and make them a little mushy...the bigger one is able to eat the peas without me "squishing" it a little, but the smaller one isnt... they love their peas though, zucchini is next on the menu (once I get to the store:))

So, a question about the lettuce clip...I havent tried this yet because I assumed my fish are too small...do you just take a piece of lettuce and clip it to the side of the tank?  Are they able to eat it?  does the lettuce become soft enough eventually for them to get pieces off? 

thanks

cheri_alexander: If you'd cut the peas into really small pieces (about the size of your moor's mouth) it should be fine I did that the first year or so for my smaller fish

Ireiden: Some people suggest blanching the lettuce a little before feeding it to the fish as well, you could try both steaming and blanching if you want, why not?

Oh duh...I don't know why I didn't think to cut them. When I read to feed peas I imagined big fish eating whole peas. LOL. They are happily eating broccoli now. I let a piece sink and Blackthorn actually nibbled it a bit. Maybe he just prefers to eat off the ground since his eyes turn downwards.

Well today I bought some "sinking granules". They are tiny and Blackthorn, Ash and Willow went crazy for them at first. But now I realize they are just spitting them back out. Are they too big, or too hard? All the larger fish ate them easily. Now I'm going to have to vacuum even though I just did yesterday. Lol!

My fish are about 2 1/2" and when I feed pellets or granules, I crush them, then swirl them around in a small cup of tank water for about 5 seconds, then pour them in.  The pieces sink and my fish love them and eat them with no problem.

Before I started crushing the pellets, I fed them to a really small goldfish, under 1",and  my fish immediately gobbled up 3 in a row, then died.  I think they expanded inside.  So I am extra careful now.

i also think that one fish is sick with something i have never seen before on any of my fish in the past.

my tank is a 5 gallon corner tank and the fish are small about an inch  i have been changing a quarter to half the water the past few days just to keep the water clean and a little warm till i get a light for the tank on the account mine burnt out.i do have a filter i bought one that i have had in the past that works like a charm.i have not tested the water yet ...i still have to go back to the pet store to get that done.i bought the fish together all at once from the same tank at the store.also i did have to clean the tank once the day i got them due to my son putting cat food and bread in the tank so i moved it higher up and out of reach.well all i know is the fish is white and it has white hard dots all over its back fin and now on its body and one of the other fish has the dots too. but i noticed later in the day when i got them that they had these dots. i will be going to the store friday is the earlyest i can go but now i know to look better at the fish before buying ... i also had my mother in law pick them out she has never had fish before.

kate88: You've kept goldfish for as long as you can remember and... you've kept them in 5 gallon tanks? I don't want to offend you, but this is pretty serious abuse of these poor fish. How long have any of your goldfish lived even? The oldest goldfish alive was 45 years old, which says something if you have baby goldfish that die after a year or two.

You really have to buy a larger tank, your fish have ich, a parasite and the bad water quality in the tiny space will most likely kill them even if you'd try to treat now, in fact they'd die especially if you'd try to treat them in that tank.
So, for 3 fish, you need a 30-40 gallon tank. The absolute minimum is a 20 gallon for one goldfish and you could keep two there, goldfish are very social and friendly creatures and love playing with each other. A 30 gallon for two fish would be the absolute ideal though.

The 5 gallon isn't big enough for any fish, maybe some snails or a betta? Please don't leave the fish to die just because you can't/don't want to buy a big enough tank. We'd love to help you if you'd want to try making these little ones thrive