I have 4 rays at 4 inches in a 60 gallon tank, filtered over fluval 404 and fluval 4 internal, 50% waterchange every week, no problem at all?![]()
you're lucky then. depends on how much you feed them too. once a day, or multiple times? i wouldn't dare leave a 60gal tank with 4 rays in it for a week with only a half water change. especially in their prime growth stage.