i purchased an ansestoria (forgive my spelling) (i now think it is a bristlenose catfish) about 8 months ago, told by the lfs that it is an ideal alge eating fish. it has not made a huge impresion on the alge, but it is now geting huge, it was a pretty fish at 1/2 inch at purchase, it is now 4 inches long and trying to dominate the bottom of the tank, just how big can they grow?