Brown diatom dust

[Metrontech]

Ok, so I got this figured out!

Might be a rookie move, but I put medium sized crushed coral in my one piece sump when I put this setup together

I noticed there was a lot of waste buildup in there, but my nitrates were ZERO

I think I was getting the brown dust from that dirty water...or whatever scientific term you would use

So, I wet vac'd the entire thing out and put all new Salt water in there

Its been 2 days and the tank is doing great...

I am putting my 55 Gal sump in this weekend which as sections so I will be able to control things much better!

Thanks for all the input!!