Fought major cyano problems in my SH tank. Not uncommon given the large feedings and low flow. Basically I just let the tank balance itself, add macros (I know you've got some) let things come into a balance, make sure you've got a good varied cleanup crew. Fission Nano skimmer will fit in even a 2.5g, worth taking a look at.
Balance took 4 months to acheive...
So basically, macros, increase flow, and give things time to settle.
Andy
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