At a loss. What is this?

SoonerBerrios · Dec 1, 2016

for the past week I've been dealing with what looks to me as dead algae. It's this white-grey almost ash like growth on my rock. About 3 weeks ago I eliminated a cyano problem with chemiclean and was very successful. I didn't dose the recommended amount and have done a 20% and two 10% water changes since then. Then I started noticing this growth (pictures to follow).

Can anyone help ID or have a solution? Trying to avoid taking out rock and brushing.

parameters
Nitrate: 2
Phosphate: 0
Alk: 9.8
Calc: 450
Mag: 1700 (buying new test kit, hasn't changed in months)
Ph: 8.1

Thank you all!

SoonerBerrios

CodyRVA · Dec 2, 2016

How old is this system?

MaiReef · Dec 2, 2016

I have had that and I used a baster to get ride of most and then used my finger to loosen it. Most of it came right off. It seems to happen to me more as my tank ages. 3.5 years now.

SoonerBerrios · Dec 2, 2016

CodyRVA said:
How old is this system?

This particular system is 3 months old. Original water, live rock came from a 40B that was up for 9 months. Sand was completely new and so was the remaining 60 gallons of water.

SoonerBerrios · Dec 2, 2016

MaiReef said:
I have had that and I used a baster to get ride of most and then used my finger to loosen it. Most of it came right off. It seems to happen to me more as my tank ages. 3.5 years now.

Good to know that it happens to others and not something that is completely out of whack. Sounds like a little elbow grease may be needed this weekend during maintenance. I dig your avatar, I'm a big TOOL fan myself.