I have 2 clowns, one of which looks like he wants in on the BTA, but the other keeps him from it and claims it as his/her own. Should I get another BTA for my small 20 gallon tank? The current one has grown to be quite large - prob 8" diameter, but idk if/when it will split? I think I have had it a few months and it has probably tripled in size. All thoughts and input appreciated. I know the other clown doesn't NEED an anemone.