I didnt cycle my bettas tank before placing him in there...i didnt really know how important a cycle was and just assumed things would work out, then i did more research and wish i had cycled it before placing him in there...too late now, so ...how often should i be changing my water...its a clean tank, sand bottom, lots of plants and moss balls, filtered, lit and heated. My test strips read well, but it doesnt tell me ammonia levels. Right now im doing 30% water changes once a week. Should i be changing the water more often? How much % should I be changing when I do it? Food does not get left in the tank, he gets 3-4 pieces of food twice a day and he eats all of it.