Planted Tank Guru
Join Date: Dec 2004
Location: Skagit County, Washington State
For me, over the years, it seems something in substrate is what always causes the most trouble in a tank. If I have a truly inert or approching inert substrate, everything falls into place. In your case, who would have known marble could be a calcium source? I also assumed marble was some sort of super heated granite and inert as well.
Three Tanks...Eheim 2128 & XP3-90G, Eheim 2128-65G, Eheim 2232-25G.... Tek 4x54 watt T5-90G, Aqualight 96watt PC 65G low tech, 65 watt Aqualight-25G.... Hydors-90G & 65G ... Flourite in 90, 65, & 25 Gallons, .... Auto Water Change/Auto dosing on 90 & 65 gallon..... AGA member......