Red algae?

[timothymd79]

Pretty new here. Have a 100 gallon mixed coral











reef tank. Set up for 6 months. Here for a few weeks I’ve been battling some red slime algae, ai think or maybe diatoms. It blows off of rocks and I try to filter it out but it seems like it is back with vengeance within 24h.

Parameters are:
Ph 8.0
Nitrate 3
Phosphate 0.03
Alk9.0
Calcium 350 dosing and bringing it up
Mag1200
Salinity 1.025

I dose AFR and just recently started dosing nitrate and phosphate and those levels have just started to become detectable in last 2-3 weeks. Im already running lights reduced.

What else can I do to get rid of this annoying problem? It’s encroaching on corals and making them unhappy. GFO? Just keep working through as part of a maturing aquarium?

 

[zfisk]

Definitely no gfo, if you’re only at .03 phosphate, gfo will rip the rest of the phosphate right out of the water and you’ll likely have much bigger issues. Keep up with normal maintenance and water changes, the uglies will pass.

 

[timothymd79]

Definitely no gfo, if you’re only at .03 phosphate, gfo will rip the rest of the phosphate right out of the water and you’ll likely have much bigger issues. Keep up with normal maintenance and water changes, the uglies will pass.

Thanks. It’s hard to capture in the photos and I just basted it off the rocks. Feel like I have to be doing something wrong here.

 

[Mr. Mojo Rising]

I don't see cyanobacteria (red slime algae), it looks brown to me mixed in with some hair algae. It looks and sounds like the brown algae is dino's.