Cyanobacteria Removal?

[Hugh Mann]

For whatever reason, I had a bunch of cyanobacteria start growing in my two tanks. Introduced fish back in February, and I went through the usual diatom bloom, that cleared up and green algae started growing. Then velvet outbreak , removed all my rock and sand, and setup a plastic bin to keep my eel in while I treated with copper.

Fast forward a few weeks, and I've got cyano growing like mad. Wondering what might be causing it to grow, and how can I get rid of it? Can I suck it up with a siphon during a water change, rinse it off the rock in the eels bin? I wouldn't be worried, but I don't have any and can't get any cuc to eat it, and have heard it can be harmful to fish. Any tips would be appreciated, thanks.

Perameters are
Temp 75
Salinity 1.024
Ammonia 0 Api
Nitrite 0 Salifert
QT Nitrate ~80 Salifert
Eel Nitrate ~50 Salifert
QT chelated Copper 2ppm Hanna

 

[tsouth]

Hey Hugh, hope all is well with you and yours (the eel of course ) Can you answer a couple of things?

What is your source water? Tap, Ro/Di, Distilled, etc etc
How much flow do you have within the display tank? Heavy, medium, low?
What are your feeding habits? What are you feeding, How much of it and how often per day? If it's a lot - reduce if possible

Cyano bacteria typically spawns from low flow, high nitrates, and high phosphates. I see your nitrates are on the high side, so lowering that would be of utmost help! Increase skimming and filtration, or feed less

You can most definitely siphon it out. As far as rinsing it off in a different bin - well the cyano may just come back and it seems like a lot of effort to be honest.

 

[Hugh Mann]

I use Rodi water, tds reads 0-4 depending on the day.

Display tank is 55 gallons with an aquaclear 110 and 70 for filtration/flow. No skimmer due to copper treatment.

Eels bin is ~25 gallons and all it has is a small powerhead, the flow isn't listed. My hob skimmer and other small filter won't fit on the edge of the bin. Lfs sold out of sponge filters, one on order. Gets a daily 1.5 gallon water change.

Main tank I feed a small amount 3x daily. Got a Cleaner wrasse in there, and with only 2 other fish needs plenty of feeding so I have been told. By small amount I mean the Betta gets 2-3 bite sized pieces of shrimp/clam/squid/scallop/krill, other 2 get a mix of mysis, brine, shredded squid/scallop/shrimp and omega one flake, all enhanced with selcon+garlic. There's always a piece of nori in for the wrasse. By small amount I mean ~1/16th of a teaspoon.

I feed the eel heavily every second day. Shrimp, krill, clam, with selcon+garlic. Picky bugger won't touch anything else.

Good to know. If I can manage the cyano for 2 weeks, I am moving everything into a 120 gallon.