UPDATE!!!!
I guess I spoke to soon!!
2 days ago I moved my babies into Flowering units. The flowering units look something like this (see pics below). It's StinkBud design. As you can see they have cut out slits in the boxes. I mixed my Dutch Pro Bloom and also added in Keep It Clean. The fucking next day I am noticing the water is getting cloudy, and today it stinks a bit too. The pH is raising BUT it's controllable at the moment by adding a bit of pH down once a day.
I am actually running 2 of these units simultaneously with 100L water each. So you can imagine the amount of nutes it takes—1/2 bottle basically—so you'd expect to get 2 week run out of it! Not to be changing it in 2 days, both!, and I won't.
I even called Dutch Pro and they were quite surprised as it almost never happens. So why the f.. does it happen to me, within almost 2 days? I admit my water temps are 23C, but c'mon it ain't the worst! I know that 18C would be great, but c'mon 23 ain't supercrazy!
Now, I am done with my rant, let's talk cause and temporary solution:
There are slits cut out, so light-leak. But how come StinkBud does't have problems with light, since he is and has been using the exact same system?!? So I might exclude light-leak out of it; I am sure he would have mentioned it!
Because the water drips back into the Res, I doubt there is a need for an airstone. Water drips in for 1 minute every 4 mins. That should be enough, I guess.
I am not gonna change the res because the water isn't slimy at all! Before had I bought Keep It Clean, it would get slimy, but keep it clean really sorts that out so far. With that being said, my roots won't be slimed and smothered.
Also my roots do not depend in Oxygen solely from the water since they are dwelling in rails, not in the res; so I am not the bothered about Oxygen release in lower temps.
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Also worth to mention, the stinky cloudiness is only present with the nutes. I started up my Cloner the same day as flowering units and the water is clear and fine!
Also my flowering units: 3 weeks ago I was testing them all for leaks, so I filled them up with just water and then got lazy and left the water there for 3 WEEKS, NO CLOUDINESS NOR STINK whatsoever. So I am adding this into the equation that light-leak is most likely not the culprit.
So what should I do guys?