Thanks guys for the responses me and my cousin will probably go with for tankmates for the turtles are a black wolf fish curupira, golden dorado, black wyckii catfish/asian red tail catfish wyckioides, west african lungfish, two toed amphiuma or three toed version, and possibaly a pom pom/reticulated knifefish if it can handle itself well with the other aggressive fish and turtles and For the turtles a slider of some kind, a painted turtle of some kind, a west african mud turtle, a siebenrocki snake necked turtle, murray river turtle, and possibly a florida soft shell turtle.