i have a 5inch juvinal rhom piranha that litterally hides all the time in my one large cave, i have him in a planted tank with a redicluse amount of top plants to attempt to block some light but he still just hides and im pretty sure he just eats at night so what if i just left the lights on for a few days strait would that help to confuse him into thinking he has to come out to eat with the lights on? idk any ideas to get him into comming out? i have some dither red blue tetras and i started with 15 and only have 6 left and im assuming hes eating them at night. any advice? thanks in advance