Low Oxygen Substrate turns gray / black. Why?

[taricha]

Let’s appeal in a new post to our fellow citizen scientist reefers to have them test their substrate this way, of course, after the test is sharpened up a bit and we include a couple questions about their system. The results would be an interesting survey of substrates.

That's a great idea. I'll mess around with ratios and timing to see if enough color can be produced to be interesting.

 

[Dan_P]

That's a great idea. I'll mess around with ratios and timing to see if enough color can be produced to be interesting.

OK.

When you have a beta test ready, I will try it on my substrate.