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There are some cheap spectroscopes on ebay that can be used to confirm colors. Might be good to have a known good 660nm for comparison. NEW...
I would try adding the substrate into the epoxy mix and casting or pressing into a mold. (http://mold-making.com/imitation_sandstone.htm) Might...
I have a 10 gallon brackish (18 ppt) running with a DIY upflow scrubber and also been getting yellow water. This is a tank for feeders; the only...
Looks like the concept is progressing nicely. A suggestion for revision 4: add a removable plate to block light from entering the wheel section...
Are those custom PCBs for your LEDs?