HELP , Last week I put 150lbs of beautiful fine white ESV sand in my 90g. (I am still cycling with LR and LS in my Refugium) I got the bright idea to put 40lbs of GARF LS and grunge to activate the sand and to further the cycling process. Well 2 days later now that I can see through the tank again I have a very silty blackish substrate on top of what was a really nice looking DSB. I'm a bit nervous to add more sand on top of this grunge. Any opinions if adding more ESV sand on top of this would cause any problems. Any other suggestions....
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