Problem with cyano!

nicolaszapata · Apr 15, 2020

Hi guys, its my first post. Im from Chile, sry for my english.

My tank is 130g + 20g of sump, 5 months old, and is an ULNS SPS dominant tank.

Lightining is 4 hydra 52hd with 100% blue and 70% white, red and green (13.500K).

My parameters are Ca 400 Kh 7.3 Mg 1380 PO4 0.0 (salifert), NO3 (aquaforest).

I add bacteria (aquaforest) daily, and have a reactor with phosphate minus, carbon and zeos.

Until 1 week ago the tank was wonderfull, sps growing fast and colorfull, but one day I had cyano and green filamentosus algae.

Like 2 weeks ago I feed with 2 shrimps and 2 clamps a copperband that finally diez, but I think that its the cause of the algae.

I check parameters yesterday and I have NO3 0 and po4 0 (Like always).

I dont know how to do it now. I will remove it manually dialy, turn off white reds and green from lamps and reduce the day 2 hours.

My doubt is about NO3, I need to raise them now or maintain it?
Skimmer: its works 12hrs daily, now I need to turn it off or use it all the day?
Feeding: the same or more?
Adding bacteria: stop it or continue?

Thanks u guys, and sry for my english

I add some pictures of my tank before cyano

John08007 · Apr 15, 2020

Awesome tank, and is that the pacific out your window? Nice to see this hobby is shared around the world. I am far from an expert but have had cyano a few times. I believe even though you test phosphate as zero, this is what feeds cyano. I believe it is reading zero because the cyano is using it out of the water as its produced. I typically run a gfo reactor to drop my phosphate.

nicolaszapata · Apr 15, 2020

Yes! Its pacific, cold water hahaha.
I changed the phosphate minus 3 days ago.
Now I will syphon the cyano

nicolaszapata · Apr 15, 2020

This is my algae problem

nicolaszapata · Apr 18, 2020

cancun · Apr 18, 2020

Very nice tank....so cool living so close to the ocean. When I have had cyano problems, they usually came from carbon dosing to lower phosphates or nitrates, or adding a bacteria to lower something. So one NO3 or PO4 bottoms out before the other one hence Cyano. I learned my lesson. I leave stuff alone.

Only luck I have beating Cyano is using Chemiclean. Doesn't hurt fish, inverts, or corals. If you go this route make sure you follow the directions to the letter though!