My opinion, and its just my opinion is that carbon dosing does throw things out of whack. Ive tried a few kinds, some reefers I know have tried a few kinds and we've all experienced some pretty traumatic results from what we think happened while dosing.
I've seen your set up, its awesome. With your lowish fish load you should be able to maintain good parameters with regular feeding and good skimming/waterchanges.
Are you experiencing bad hair algea or something, is that why you want to dose or are you worried about high nitrate with your sps coral?
I'd ween off carbon dosing again and see if you can stablize things naturally. Do a few larger water changes and let the system settle after having carbon dumped in it for a long time.
Again, just my thoughts through my experience. Im not a master but I have a 125 heavily stocked, like over stocked and my nitrates stay at 5-10 with skimming and cheato. Just something to think about.
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