Frogspawm dying - Could be lack of nutrients

[bulabr]

Hi Guys
I have a question about water nutrients.
In the past, with the objective to rid off green algae and ciano, I put a big quantity of pellets EcoBak in the reactor, plus another reactor with ROWA to drop the phosphate. I got the results of 0.00 Nitrates and 0.00 Phospate, which I found out that it was not good at all. Seems that the corals need a low quantity, not zero. In top of that, I have a sump with chaeto more a scrubber. Now I am noticing that my Frogspawn coral is dying, and some mushrooms are not OK as well. I have ciano coming back also. My question is how to stop the frogspam dying and if the scrubber plus chaeto is too much, making my water poor of nutrients...As I know, if I dont have nutrients enough...I dont have cieano...right? :headwally:
My parameters
Tank time: more than 3 years, size 75G, sump 25G, skimmer reef octopus 150.
RO/DI always with 0.00 TDS
PH: 8.0
Temp: 26.5C
Nitrite: 0.00
Ammonia: 0.00
Nitrate: 5.0
Salinity: 1.026
Alk: 196
Calcium: 440
Mg: 1380
I have dosing with 3 parts as well - Alk, CA and Mg

Cheers

Bulabr

 

[NYCBOB]

Have u tried running carbon to remove things from the water? I suspect ur frogspawn dying not from lack of nutrients, but something in the water.

 

[cjclaflin]

Ph should be around 8.3 i thought

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[ckw_1980]

Your alk should be 8-9 dKH. Probably just a typo but if not there's your problem. Good luck

 

[LX20000]

His Alk is 10.97 in dKh