I agree with all of the above. He says it weighs about 225 grams (1lb=453 grams unless my math is wrong). But I don't think it looks like it weighs that much. I suppose it has not shed since he's had it (4-5 weeks). Hopefully it is actually eating & you won't have to go through the whole ordeal of assist-feeding.

I would also offer less if he keeps the tank (unless you need it). Keep us posted. Good luck!