I have a Alligator Gar,Wolf Fish,Common Pleco,and a Polypterus currently in a tank together,another tank I have is a tank with a featherfin catfish and a lima shovelnose catfish as well as a bala shark and a spiny eel..can either of these tanks have sand in it or will my fish kick it up and possibly burn out my filter..also if you can recommend a best sand that'd be great! 
