I keep a mixed tank of cichlids and med. sized catfish in a 270, weve always wanted to build a docking platform and exterior dry area inside our top box, i understand fly river turtles are the best and extremely expensive and illegal? But overall what could be another option we could try? Ive seen other soft shell turtles and but overall would the main most common turtles really take on largish cichlids and others? I would love a species list of at least possibilities that we could further research. I absolutely love this idea, growing up we had a 110 gallon tank with two red ears and a large bala shark that they couldnt catch and to this day i love this idea.