I'm slightly concerned here.
Went and mixed up MC at a 2g/gal ratio for my 45gal RDWC.
What has me concerned is the ppm of that mixture.
Base PPM (700 scale): 340
Base pH: 8.4
Resulting PPM: 970-980 (it fluctuates between)
Resulting pH: 7.4
Full mix:
- 90ml silica (Protekt, at 2ml/gal, NPK of 0-0-3)
- 90ml CalMag (Gen Hydro, at 2ml/gal, NPK 1-0-0)
- 90g Mega Crop (current formula, 2g/gal)
So far I've added 90ml of pH down.
Now, where my concern lies is the ppm is a bit higher than expected. About 100 points. Maybe that makes a difference, maybe not. I am aware that GLN says to not be concerned with the PPM, and I did correctly weigh everything up. That being the case, I expected the PPM to be about 880-890, not 100 higher, as the nutes (all combined) should have raised added about 540-550 PPM on top of my 340 base.
Maybe it's nothing, but seems like it would fry a baby plant at that high of a dose.
The calculator on the GLN site says 2g/gal, so maybe not. It didn't fry up my promix kiddos 6 weeks ago, so maybe this is all for not. However I would hate to drop babies into the RDWC and burn them up, too.
So before I add another round of pH down, I thought I would see if I could get an opinion. If need be I can take a little out and replace with fresh water.