Mould, pythium or algae? Help!

New to this first of all.. running a rdwc system and just started flowering 2 days ago. I rooted seeds in rockwool and potted in clay pellets. I checked the res today and noticed this brown residue everywhere. Can anyone help tell me what it is and how to remedy the problem. Many thanks in advance

What are u using for nutes, any hydroguard or z7

How often do you change your rezz

BobThe420Builder said:

What are u using for nutes, any hydroguard or z7

How often do you change your rezz

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Change the res every week. Im using plagron A, B, zyme, root zone, beneficial bacteria and just started using green sensation. Res temp is 20°c and no light leaks in the system. When I change the res I add h2o2 for a day before adding nutes. I uave ordered some hydroguard today hoping it will help with the issue. Do you have any idea what it is?

What's beneficial bacteria,I mean what are u adding

Its a tea solution