Thanks there! I already took out 3 sucky fish from the tank but meanwhile I left 2 inside, they are helping to clean the glass, since they only suck on the glass I guess there's no harm for the axies? I saw once olive tried to bite the fish, but it wasn't success, she just not strong enough to do that.
Olive's underside's a little pale too, but with some little spots, I think it looks more contrast in the photo as well!