What is this junk?

[jostafew]

Thanks for the feedback everyone. I just finished wrapping the tank and sump for total blackout and I'm preparing for a big water change when it's time to open them up again.

Having to do this for the 2nd time in 5 years I'm hoping that I will have paid my dues to the reefing gods and I can just enjoy some success for a while without any major disasters