Welp, the double dosing macros after water change experiment has come to a screeching halt due to a severe GDA outbreak in all 3 big tanks.
It's mostly on the glass. The 120 has it the worst, not surprising because it has the most light, the 75 is next and the 50 is a mere nuisance level. When everything is right there's none at all. Sometimes I'll go 2-3 weeks without even touching the front glass.
It started showing up on the front glass of the 120 about halfway through the first week. No big deal, just wiped it off at water change and turned the UVs on.
But the second week it got worse, much worse in the 120. By day 3 it was seriously blocking the view.
So day 5 I did an 80% WC on all three tanks. Dosed back the single amount of 10/1.5/10 and thats where Im staying for a while, 3x per week.
If you recall I'd dosed 1.5x after water changes for I think 3 weeks prior. Plants seemed to like it. Then I went to 2x. Plants seemed to like that too for the most part.
It has to be the culprit behind this GDA because its the only thing thats changed in recent weeks. I think after 2-3 weeks it finally built up to peak levels, which is too much
The only plant affected is the Lagenandra in the 120. Probably wind up just cutting these two older leaves off but Im gonna wait a few days and see if it clears up by itself. This plant is amazingly efficient at ridding itself of algae once the cause is dealt with.
Wallichii in the 120 aint worried about much of anything, already at the surface again.
Here's the pic from 9 days ago. That's why its best to start the tops out very short when you replant. If you start them out tall close to the sweet spot you'll be doing it every week
Another interesting development is Hygrophila siamesis 53B in the 50 fattened up a lot over the past few weeks. Im thinking due to the higher macros, we'll see if the trend continues. Hard to tell from the pic but that one top is nearly 6" wide. Thats pretty big for the species, at least for me so far.