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Yes, we've tested the RO/DI water, and it is fine. Our sand was live sand purchased from the LFS. It is in both tanks, so that isn't the source.
Its a 75 gallon tank, with about 65 gallons of water in it. The substrate is sand(coarse and then fine), there is also a level of live sand in there...
We are making our own ro/di filter unit that leaves about zero to two ppm of dissolved solid particles in our water. We have tested our water with...
I am new to this group, and have a question about phosphate levels. Ours is apparently sky high. Honestly, we can't figure out where it is coming...
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