Mark,
I would rearrange the tank so the THREEE GBTAs were not crowding each other the way they are right now. Plus, I think the clowns would like at least on GBTA to be lower in the tank.
Yup, I said THREE GBTAs
Looked at them with a flashlight at 4 am this morning during an insomnia bout and saw three mouths in there. The main GBTA and the second clone have not yet split, though. Maybe later today or tomorrow they will be completely apart.