Mate - something looks off here.I know.. I keep thinking something has to be wrong LOL
400ml daily of reef code B on a 300G tank means you are adding 3 dkh per day, that is insane even for heavily stocked SPSs.
Whats your tanks Alk/ CA/mg level at right now? Do you get a ton of precipitation? If so, thats a lot of wasted dosage and your tank actually needs a lot less.
Also, is that 8.9ph reading correct? Even in perfect (unelevated) co2 levels (co2 lowers ph) a 8.9 ph would in theory mean that ur alk is somewhere north of 20 dkh...
I would check your params now - if all the readings are correct then something is off here. Normal recommended SPS levels are 8.3 ph, 8 to 9 dkh, 450 calc, and 1350 mg.
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