Max % water Change

[Chad]

Ok.. My tank has more liverock than can be explained. Its PACKED with live rock. Probably more than most people who have a similar sized tank.

Feeding, is almost NIL.. I feed my sun coral every couple of days and that is it.

Sand bed is about 1 to 2 inches in many places.

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I am pretty confident the Nitrates are not a issue where I was overfeeding or not having enough live rock or not skimming (which I do skim on my 20gal ) ..

I have 3 fish, a small neon goby, one damsel and a small clown.

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Not sure what more I can say other than for the past year I have been using change water that generaly had been sitting in a bucket mixing for more than 4 days. Because I had read it was good to let it mix for a few days. Over that time period I have been battling an ever increasing Nitrate problem. Which I could never figure out. Until I decided to test my change water and all of a sudden I found out I have been adding 25 ppm (or more or less) of Nitrates into my tank every time I did a water change.

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Tank photo to show live rock.. Hard to see but it is live rock right to the very front except for about an 1 inch or so on the right and maybe 2 inches on the left. Any more live rock and I'd have no corals.