Diatoms...problem just won't go away.

[Reefie]

ZEOstart2
Intended use: Accelerates the cycling process in new tanks, color enhancer, soft coral growth and PE
Positive results: Growth , PO4 und NO3 reduction
OD Symptoms: brown film forming air bubbles at lighting period

For the substrate, I'd suggest sand sifting Goby

I could be wrong, but the lighting at 30% may increase the growth rate for Diatoms as your LED's are emitting a spectrum that Diatoms prefer? I'm light acclimating my tank also with a pair of Panorama PRO's at about 50% and I'm seeing a bit of a Diatom breakout as well.

The Coral Snow & ZEObak dosed together work towards getting rid of Cyano, not Diatoms.

Are you getting a buildup of mulm at all? You can try Bio-Mate to reduce the mulm.