Currently I keep 5x 7-9” bumblebee cats, a pair of Channa obscura, three climbing perch, a female fossilis catfish, a synodontis and a musk turtle in one of my 80ukg corner tanks filled 3/4 full and all get on fine and have been in there for four years to date.
Cohabiting will depend highly on the decor, mine has a huge amount of rocks, pipes and wood on multiple levels, as well as plenty of space for the turtle to get out of the water and a lamp for him. As for overcrowding, yes you will need very good filtration (I use home made external filtration mounted above the tank) and regular water changes as the turtle will be messier than the fish (as you know).
Personally I would have no concerns keeping the turtles with fish ( just not with all the ones you have and I cannot tell you which to keep as that is personal choice)
Cohabiting will depend highly on the decor, mine has a huge amount of rocks, pipes and wood on multiple levels, as well as plenty of space for the turtle to get out of the water and a lamp for him. As for overcrowding, yes you will need very good filtration (I use home made external filtration mounted above the tank) and regular water changes as the turtle will be messier than the fish (as you know).
Personally I would have no concerns keeping the turtles with fish ( just not with all the ones you have and I cannot tell you which to keep as that is personal choice)
