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I started a new 55 gallon tank two months ago with eco compleat substrate, 260 watt coralife light fixture, pressurized co2 system, and plants taken from existing tank. I was going to try to do a fishless cycle with fish food but after three weeks ammonia 0. nitrites 0,nitrates 0. Added six zebra Dani's hoping to increase blood. After two weeks readings still no change but algae was a problem. Added three algae eaters and six starriest mollies (big mistake) did not know they bread so fast. Lost one zebra and one algae eater, gained at least 12 baby mollies. All readings still 0 after two months. I do 50% water changes weekly. Fish and plants look good, but still no nitrates. What am I doing wrong?