Ah I found this interesting batch of information on a website - (Link is not visible to guests. Please register to view.)

"Scientific Name: Physas sp.
Common Names: Bladder Snail
Care Level: easy
Adult Size: 0.8 inch
pH Range: 7.0-8.0
Temperature Range: 22-30 degrees Celsius (72-86 degrees Fahrenheit)
Origin: Cosmopolitan
Temperament: peaceful

Compatible Tank mates:
Bladder snails will work almost perfectly with all community setups provided the water conditions required are met. They should not however be mixed with fish that will constantly harass or harm them to death such as loaches of the botiine genus and puffers.
Diet:
These snails will eat anything from algae, carrion to commercial foods.
Tank Size For Adult: As these proliferate rather quickly, there is no set guideline on stone as they will add up to the bioload faster than anything else can.
Lifespan: 1-2 years

Narrative:
Bladder snails are one of the snails found to hike amongst plants, woods and other decorations. They have a potential to overcrowd a tank due to their ability to reproduce rather quickly beyond the aquarist's control as these are asexual. They are observed to start reproducing at an early age by laying several egg sacs each containing dozens of baby snails. Incubation period takes one to two weeks and the newborn snails reach full grown size in less than four weeks.

Despite the fact these snails are considered a pest by most aquarists, they will readily eat decaying organic matter and will not eat healthy plants as alleged by most planted tank enthusiasts. It is purely coincidental that they could simply be feeding on the plants due to the absence of vegetable matter in their diet or the plants are dying from nutrient deficiency.

There are actually several species of bladder snails however due to various colors, patterns and shell structures, it has become increasingly difficult to properly identify the actual species so most people do not bother to identify them anymore."

So 1 - 2 years 

I have loads of bladder snails! Started with two and now I keep finding them they breed very quickly but are amazing to watch! I also have two apple snails which I am trying to breed, two ramshorn snails and as yet an unidentifed snail. I love all of them. Bladder snails do some great water acrobatics. I have two tanks set up specifically for snails both have a few plants in, one is filtered and te other has an airstone. I feed them on fish flakes, fish pellets, algea wafers and cucumber twice a week. I find them very easy to look after. Sajacobs if you are planning to have snails in with fish I would recomend putting an apple snail in as they are sexed and need one of each gender to reproduce. I am not sure with bladder snails but I think they can mate on their own as I have one bladder snail in a tank and she keeps laying eggs and I keep finding more snails in that tank. So not sure but in a month I have gone from 2 bladder snails to 6. Doesn't sound that quick but I keep destroying eggs everyday. The only thing I would say if you are planning on keeping snails with fish is to make sure you have got somewhere else to put them incase you need to treat the fish with anything as most treatments are not good for snails.

Thanks skwishee and Vic

I'm on the hunt for an apple snail.  I think this hobby slowly sucks you in.  Just one fish...then snail...then plants...what's next??  A bigger tank??

Any input on what a healthy snail looks like?  Do they need to be quarantined?

With apple snails as Skwishee said make sure it has a nice shell I would say look for one that is active if possible, might be difficult as they aren't normally active during the day too much or one that is near the top of the tank and stuck into the side not floating, even then just ask to see whether they sink or float. If they float their maybe something wrong in which case it may die not long after you have bought it. They should sink to the bottom as mine do all the time, but this can bring problems as the do sink when dead aswell, but if they were stuck to the side when you picked it they should be fine!
 Fish keeping really does suck you in, I currently have 4 tanks set up and I am looking for a 160litre tank for flash and Merle. Like Skwishee I also have lots of plans for my fish when I get my own place for now these will have to do.

I often compare the prices of things, to a) what sized tank could that same amount buy and b) how many goldfish would fit in that tank?

I don't have any experience with apple snails (as I've mentioned before) but I find that my snails (un like Lucky) are rather slow eaters  So it can take them a while to eat things. For example I stuck in a few peas to my snail tank on Monday or Tuesday and there is still some in there today 

Courgette/Zuchinni is another thing I feed them and I also occasionally feed them crushed fish flakes -not sure if that last one would be good for an apple snail though?

Thanks fantailer

I've been thinking - gee I'm worried about quarantining the plant when in fact I should be worried about the snail eating it

I love my snail. I didn't think it would be such an interesting creature. He didn't eat the carrot I left over nite.  Going to try a blanched cucumber. A fussy eating snail?

Well Vic I think you answered my question from this morning....

Last night I put in a very small piece of carrot (something this new fish is not interested in). The carrot was gone this morning.....so I guess it wasn't the snail. My new fish must have eaten it.

Gosh I hope the poor thing doesnt get hungry.

Oh and also!! Ta Da!!!

My snail beach is complete

It might get altered as things go along, but for now, I'm glad my snails have a nice little set-up now

That's so cute! Man, they're such lucky snails

Cool

Lucky snails.  I like the shells especially.

Awww thanks guys 

Vic you could totally do a tank like this! All it is, is sand with some shells and bits of gravel chucked around, one or two stones and some cuttlefish 

Plus I really like the pattern in the sand, that the snails leave 

There are ways to tell the difference between male and female apple snails 

I'm not sure on the details myself, but found this website that might be useful (Link is not visible to guests. Please register to view.)

Vic
I really enjoy my snail too.  I find it so interesting watching it make it's way around the tank.  Eating whatever it's finding. A gentle soul.  

I'm not ready for babies.  I believe my snail is female (I had a peak under the shell ). I ordered a mystery blue snail.....so hoping its a female.

But knowing my luck with the tank...it will be a male and I'll have a tank with baby snails..

I'm a softie....I would probably end up with a snail tank like someone else on this site