I now have 3 snails in my 10g with my betta. I moved my giant apple snail out of the 55g since the yoyos kept bothering him every time he tried to come out of his shell. Anyway, my question is, what can I do to make sure the 10g is perfect for them as well as the betta? My ivory apple snail has grown about an inch and a half of shell in the 3 weeks that Ive had him, but the new shell is yellow and the old is white. Does that mean there is not enough calcuim in the water? I know once the shell erodes, there is no going back, so I want to stop it before it starts, if it starts that is.