My advice would be...
50% W/C every 3rd or 4th day...You're removing algae that has consumed nutrients and the nutrients in the water column for the bloom too.
Leave photo period alone IF you had 8hrs a day before the pea soup started and you were fine. (How old are your bulbs, old bulbs can potentially contribute to this.)
Stop adding ferts, your "plenty of osmo" should be enough to keep things going for awhile.
Give this at least two weeks, the algae should burn through whatever nutrient is making them go bonkers hopefully.
Once your pea soup is gone slowly reintroduce your dry ferts, macros once a week/micros once a week, a couple days apart....
Stay at this reduced dosing for as long as no deficiencies are detected...No need to dump ferts in if the plants aren't complaining? This might cause Fe deficiencies since you aren't dumping the micros in as much. You can either get some Fe or increase the micros? Your call.
I tend to dose very low fert amounts and tweak to any deficiencies detected. The only one I've ever really ran into was my swords demanding higher Fe.
The short answer can be get UV and the pea soup goes away, I see this as a bandaid though since you haven't addressed the why.
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Last edited by Calestus; 12-03-2015 at 08:00 PM.