I realized something pretty obvious today and almost embarrassed to mention it: if you are feeding flakes to your goldfish, soak them in tank water for about 10-15 seconds, then dump in the tank and they sink! woohoo!

Just thought I'd mention it, in case anyone else hasn't discovered this little trick yet. It's SO much more natural and better than letting the flakes float on the top while your fish struggle chasing them around.