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- Sep 20, 2026
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AFR is mainly ALK also your calcium could be falling out of the solution if your seeing it unstable which seems to be the issue here.when I used AFR I was also dosing calcium and 5ml of mag daily in a 100g tank.![]()
ok i did retest the calcium and mag and its still the same roughly so i guess thats accurate? seems weird to me regardless since im using AFR but maybe its not giving me as much as I think.
distilled water wouldn't be the issue unless the ALK is above 7.5, u should test your clean water before putting in the system. test your RODI water as well. higher ALK in any water will contribute that rise and lock out calcium.
my. suggestion would be to use carbon/chemiblue and do full tank cleaning as it doesn't seem the husbandry is all the way there. dose 40ml of calcium in your system which will raise it 40ppm. do this daily until its back in check. dont go above 40ml/day. same with your mag. if u continue to use AFR just be aware u would still need to does calc and mag.
your PH is also low 7.8 is two ticks away from acidic which starts to put bacteria in dormant phase