Theres a thread in the sticky section thats quite good that might help.
Ive got a couple of guppies that are shaped like house bricks and ive put them in the fry trap but there not dropping so ive taken them out as they get stressed in there. Mine look a lot bigger and squarer then yours but im defo not an expert. Ive got lots of plants in mine so hopefully a couple will survive and if i spot them ill fish them out.