I am guilty of impulse buying the other day at the fishstore... I bought a beautiful geophagus surinamensis that was about 6inches (if that matters). anyway I did not know that they thrive in a sandy or fine substrate environment and I have regular gravel in my tank. I always see him sifting threw it and picking up pieces and spitting them out. Is this going to damage him?? Should I just take him back?? Im worried that it may not be good long term for him, as of now he looks okay. He is still shy (I guess cause I only had him for two days) but besides that he looks very healthy. Does anyone know if he will be okay in an regular gravel tank