vetteguy53081
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With lowering to 1.009 known as Hyposalinity, it allows you to set corals back in after the 30-40 days and placing corals back in due to no exposure to copper, However certain fish get very stressed in Hypo and do not do well.Do peroxide salts with UV behave similar to hydrogen peroxide with UV where it releases free radicals which can oxidize contaminants yet very short lived. I'm currently researching sodium percarbonate as a form of creating my own hydrogen peroxide. Curious if that's what's in Poly Lab Medic?
I've considered your suggestion of vacuuming the gravel but came to the conclusion it would be more efficient to blow it with a powerhead and get it in suspension hoping the main filtration can process it. Looking into flocculants to bind the ich. No clue if latter works but might at a minimum remove any detritus hosting ich or other pathogens. Easier it is the more likely I'll do it concept.
Going to experiment with running UV post filtration so that it's more effective at treating what passes through it and dosing HP directly into the in-fluent of that filtration thereby maximizing the effectiveness of the UV to attack various contaminants beyond pathogens. Advanced Oxidation Process and been used in waste water treatment yet seems very plausible in our application. Key is disturbing the substrate and getting it's contents processed. Granted as you mentioned, might not be effective in this scenario due to advancement of infection.
BTW, didn't realize you mention lowering of salinity and yes that makes sense. Much easier to find a temporary home for unattached corals yet still an issue if it comes with rocks. Just seeking options for both the OP although mostly for myself. Trying to exhaust all knowledge so I get this right the first time although I'm sure something new will not have been thought of. Trying to minimize those.