How often is it necessary to feed the fish? I have a 20 gln that has been going for 2 yrs. I feed my tetras every other day. Is that to often? I have been told to cut back to twice a week or even to once a week. My nitrates NO2 are less than 0.1, so I think the bio-load is ok. Just wondering. I have a little algae problem, but it is being managed by the fish, so I do nothing special for it. Thanks Dave