y not put the fish from 35 gallon into the 5, the guppys, and the others into the 10 if thre not big. keep the placo in there and u can use the 35 gallons for some cichlids, Apistogramma cacatuoides are pretty,
I agree with the guys, the tank is too small for an African Cichlid, you might get away with a south american dwarf Cichlid such as a Ram. (Butterfly Rams are gorgeous fish)