[header] How to put a sucker fish in a tank with a turtle [title] Be aware that turtles are generally omnivorous. [step] Yes, turtles will eat or try to eat just about anything you put near them. In captivity, some species eat turtle pellets, which often include shrimp or fish meal, flour, and vitamin supplements. 
Dietary preference vary a bit by species, however. [title] Consider red-eared sliders.