New problem

[takeastabatit22]

So the last week I'm getting a dark red dusting in only one of my chambers in my sump. I change my floss and on the second day it's all red again.
I've also started dissing into that same compartment. I've also been battling red slime algae for a while. But have never seen this.
Salinity 1.025
Alk 9.2
Cal. 435
Mg. 1365
Pho. .034
No4 0
Temp 79.4
https://uploads.tapatalk-cdn.com/20170722/7c19a8b0d60ca77a09e5a0a4c1277405.jpghttps://uploads.tapatalk-cdn.com/20170722/792c7c19bd9974d08e342e5e2e4f0ad2.jpg

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[Animal-Chin]

Hard to really tell from the pictures but id guess dinoflagulates (spelling could be off). Is it snotty with bubbles?