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So finally..... I figured the problem that was making few reservoirs get oily, Its the black round litttle giant pumpit leaks oil, it runs on oil.

Light hits my reservoirs a bit, so im going to make covers and see if it happens again. Thanx for responding..

What's the reason for the water turning oily after 4 days, or what's the reason for reddish brownish films floating around the reservoir? 4x4 table 4 rockwool big mamas, 75 gallon reservoir. In in week 2 of bloom. Only 2 out of 9 reservoirs turned oily, what could be causing this?