GHA or some sort of algae

[CoralReefer1019]

Please see pics, I dosed some algae fix this morning 5ml for 50G of tank volume. Tank has good flow and I feed once a day hikari pellets

Alk 8-9
Cal 400-420
Temp 77
Sal 1.026
Mg 1300

 

[RobZilla04]

Really hard to tell from those pix. Turn the blue channel down and the white up just for the pix to help us ID.

Also need Nitrate & Phosphate test results.

 

[CoralReefer1019]

Really hard to tell from those pix. Turn the blue channel down and the white up just for the pix to help us ID.

Also need Nitrate & Phosphate test results.

I will try and get a better pic but it looks like gha

Nitrates are low

Phosphate are low

Both are detectable but on the lower end of the api color scale

 

[RobZilla04]

With algae, the numbers can be skewed by the uptake of both nitrates & phosphates. IMO toss the API kits, get something with better track record. I admit for a while I kept testing Nitrates with the API, but once I switched to Salifert the results were more consistent. Hanna checker for Phosphates, nothing is better or easier.

If there is a bit of GHA, just feed less for week or two or run some GFO in a reactor. Follow the GFO with GAC either in the reactor or bag. Repeat if still necessary.

 

[CoralReefer1019]

With algae, the numbers can be skewed by the uptake of both nitrates & phosphates. IMO toss the API kits, get something with better track record. I admit for a while I kept testing Nitrates with the API, but once I switched to Salifert the results were more consistent. Hanna checker for Phosphates, nothing is better or easier.

If there is a bit of GHA, just feed less for week or two or run some GFO in a reactor. Follow the GFO with GAC either in the reactor or bag. Repeat if still necessary.

I have been running gfo for years in a tlf 150 reactor

 

[RobZilla04]

How often are you changing the media? Possibly it's exhausted and phosphates are increasing and/or the exhausted media is leaching it back into the tank.

 

[CoralReefer1019]

How often are you changing the media? Possibly it's exhausted and phosphates are increasing and/or the exhausted media is leaching it back into the tank.

I only use 10 teaspoons of the BRS Standard gfo and I replace the media once a month. I make my own water the TDS is 0 using fritz pro rpm the low Alk version