To Reef Central
Half a frozen mysis cube sounds like a fair amount of food for a 20g system. I might try cutting that to ⅙ or so. How much rock is there?
Vodka might be able to help a lot, too. You can make a DIY version of NOPOx with vinegar and vodka, if you're interested:
Quote:
To make a DIY version of Red Sea NO3:PO4-X, mix:
375 ml 80 proof vodka
500 ml vinegar (5% acetic acid)
125 ml RO/DI water
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