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Discussion Starter · #1 ·
what the hell is causing this?

Tech Specs:
Eheim 2217
Aqueon AC 950gph
Koralia Evolution 750gph
'EI light' dosing
Pressurized CO2 on for 2 hrs prior to photoperiod
Milwaukee MA957
Rex Grigg-style reactor
Rootmedic Caps
Medium-grade natural sand
3x39w T5HO 6 hrs photoperiod 20" from substrate

I have tried the 3 day blackout w/50% WC followed by Excel full loading dose after each WC, but it comes back again! WTH is going on? HELP:frown:

Also the sand is brown under the susbstrate line
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