hi i have put 2 in my tank a week ago i know they are mostly nocturnal but the prob is i dont see they are getting any food and today they have been out most of the time gliding around the glass actively looking for food, they are a good size 5"+ but the prob is they share the tank with melawis and they are eating everything before it hits the floor and i dont want to overfeed tried cucumber and peas but not interested any help pls?