I have a white male betta in my 55g. He has always gotten along with all of the other inhabitants until yesterday. I put 2 small mystery snails in the tank. One was white and the other blue. Well the white one tried to come out of its shell and the betta attacked it! Every time the snail tried to come out the betta attacked! He has never attacked my huge apple snail nor did he try to attack the medium mystery snail I used to have. So why attack these? I wonder if it was because they were so small or maybe he didnt like the fact it was the same color as him? Anyway, I moved the snails to the 10g with the other betta and he didnt seem to mind the company.