Indigo Diesel F2

@oldskoolkool, Yea that's why I started with the plant success which has a nice variety and even tried my nice healthy planted aquarium water that runs on local tap (this would be similar to your roots but for the water medium). No issues with either of these solutions in the past but I'm running the apartment very warm this summer and something just took off, ostensibly from the plant success tea. In DWC with salts there's not even a nutritional need for the bennies (no organics to break down) nor a decent substrate upon which they could grow (no soil). We are just trying to keep the roots safe, but we risk suffocating the roots as they are the only place for things to grow. So I totally agree about the variety for soil and tried that here but it's not for the warmer water in DWC (where I won't waste energy on cooling it). I'm going to try the endo (inside) monoculture Bacillus amyloliquefaciens and see if that one product can do it alone, for the sake of my dollar and simplicity, then add the arbuscular (penetrates outside to inside) Mykos WP (Glomus intradices AKA Rhizophagus irregularis) if necessary then the Orca. The Mykos WP grows and grows fast but is benign, wasting nutrients but not hurting the plant. Orca is all arbuscular and endo. Recharge is similar but adds trichoderma to break down cellulose (the other dead bennies) and includes organic nutes that would be better used in soil (but still no ectos which would cause pathology in water). So it's okay to have an overgrowth of arbusclar mycos in water since they will still deliver nutes inside the roots. Not ok to have an overgrowth of ectos. And the endos are where they belong. And you don't want an overgrowth of anything but weed.

@oldskoolkool, Looks like an external Rhizopogon spp. / Rhizopogus infection - thanks for the idea :) This is probably because I used bennies meant for soil in DWC. The tea was https://plantsuccessorganics.com/products/soluble which contains 4 spp. of Rhizopogon. I'll stick to the Mykos WP until it's gone, then go for a more specific culture for water as a medium.

@oldskoolkool, In DWC the Mykos doesn't do much but grow too fast and block out the bad stuff. Was hoping for a better balance with the plant success soil tea but something like Hydroguard or the Orca you mentioned would have been best.