02-28-2007, 07:21 AM
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OK lets start with the bio-balls. I have never seen seem used on reef tanks. They are no good, unless you keep cleaning them of all the depris they collect, if not all they do is produce nitrates. Now for the water in the sump. I have 3 sections in a 30 gallon long tank. One is for the refug, the middle section is for the skimmer and the third is for the clean water waiting to be returned to the main tank. Each one of my sections is cut shorter then the next. so I have no set water level the only part that gets low is the third. Another way to figure it out is. If you have a hole drilled in your return line (1/16" below water line) the best way is unplug the return pump and see were the water stops in the sump.if its to high remove water, if its to low add water.