- Joined
- Mar 25, 2018
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- Arizona
Hanna is the only good/accurate po4 test in our hobby. I love my ppm Hanna checker, makes testing so easy.
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How can you say lighting isn’t the issue when we don’t even know what settings the OP is using. Hydra 26’s are not that powerful unless all channels are maxed out. I think it’s probably the nopox as well, but lighting can definitely cause this type of tissue necrosis. I have a hydra 26 hd on my 29 gallon frag tank and it’s only generating 275 par 6” below the surface of the water directly under the light at 85 watts.I'd agree, stop dosing nopox, you would be better off growing cheato if that's an option.
I don't think lighting is the issue, if you are new to sps, start with montipora and stylophora and go from there.
The success of keeping corals is dependant on how stabile your water parameters are as well, so focus on nailing that down.
I'd agree, stop dosing nopox, you would be better off growing cheato if that's an option.
I don't think lighting is the issue, if you are new to sps, start with montipora and stylophora and go from there.
The success of keeping corals is dependant on how stabile your water parameters are as well, so focus on nailing that down.
I'd agree, stop dosing nopox, you would be better off growing cheato if that's an option.
I don't think lighting is the issue, if you are new to sps, start with montipora and stylophora and go from there.
The success of keeping corals is dependant on how stabile your water parameters are as well, so focus on nailing that down.
How can you say lighting isn’t the issue when we don’t even know what settings the OP is using. Hydra 26’s are not that powerful unless all channels are maxed out. I think it’s probably the nopox as well, but lighting can definitely cause this type of tissue necrosis. I have a hydra 26 hd on my 29 gallon frag tank and it’s only generating 275 par 6” below the surface of the water directly under the light at 85 watts.
Saxby schedule.![]()
This is the light setting
I don’t believe 3-26’s with these settings on a 100 gallon system is enough light.![]()
This is the light setting
Dosing lantrum chloride ?It very well can be and with a result of 0 to 0.125 that’s a big gap. Anytime mine gets over 0.08 mine start to turn brown. I lost all my sps last year from high PO4. Now I have to dose it as I always test zero.
No I dose PO4 and NO3Dosing lantrum chloride ?
Do you have a trend of the parameters that you can share? Especially Alk and nitrate. A two week trend of at least four data points each would be great.
Nitrates are too low.. phosphates too low.
Get the nitrates up to 10 ppm... and dont worry sbout thr phosphates..
Seriously..
Feed feed feed feed the tank.. or shut off anything you jave that takes out nitrates.
I jave 50 corals.. 30 are sps... none of them have ever bleached.. or browned.. ever.. and they grow like freakin weeds... i even had a bleach frogskin acfopora given t9 me... in 2 weeks it recovered and its growing fast.
Get the nitrates up

I'm not saying for sure hence why I said think.How can you say lighting isn’t the issue when we don’t even know what settings the OP is using. Hydra 26’s are not that powerful unless all channels are maxed out. I think it’s probably the nopox as well, but lighting can definitely cause this type of tissue necrosis. I have a hydra 26 hd on my 29 gallon frag tank and it’s only generating 275 par 6” below the surface of the water directly under the light at 85 watts.
Sorry ... couldn't update immediately ...
Alk - I take the reading alternative days ... Nitrate - Weekly.. Thanks for your help ... Please let me know if you need more information...
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I do feed my fish heavily as I have two picky eaters ... CBB and Green mandarin ... Yes both are on frozen foods ...![]()
Nitrates are too low.. phosphates too low.
Get the nitrates up to 10 ppm... and dont worry sbout thr phosphates..
Seriously..
Feed feed feed feed the tank.. or shut off anything you jave that takes out nitrates.
I jave 50 corals.. 30 are sps... none of them have ever bleached.. or browned.. ever.. and they grow like freakin weeds... i even had a bleach frogskin acfopora given t9 me... in 2 weeks it recovered and its growing fast.
Get the nitrates up
I would cut back on the NOPOX dosing slowly and try to raise nitrate. 1PPM increase per week is pretty safe and the goal is to maintain it between 5 and 15. Pick a number and stay there flat is the key. If the corals turn brown and don’t color up after 8 weeks, you probably need to crank up the light intensity. Again do it slowly like 1% per week until you start seeing color improvement. As soon as you see colors popping out stop increasing light intensity and keep everything stable.
I wouldn’t worry about phosphate too much. You can get a Hanna ULR checker for it but unless you are at 1PPM or higher I wouldn’t go crazy on it. My phosphate floats around 0.15PPM and I only test it once a week or so. Most of the time I don’t do anything about it.

