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OK, I guess I am confused (again).
I mix PMDD using materials from Homegrown Hydroponics. I mix as follows:
into 1/2 liter RO water
1 tablespoon chelated trace mix
1 tablespoon MgSO4+7H2O
2 tablespoons K2SO4
into a separate 1/2 liter of RO water
1 tablespoon KNO3
I know the modified Sears/Conlin formula calls for 1/2 liter. Everything
seems to stay in solution better if I mix them this way.
I am currently using a Kangaroo 330 enterral feeding pump to dose my
solution. I do this to allow constant dosing of the chemicals, and to avoid
having to mess with the chemicals daily. I mix 45 mls of each of the above
solutions into 1 gallon (~ 3800 mls) of RO water, and set the pump 40
mls/hour. The gallon jug lasts about 4 days at this rate.
Now for the source of my confusion.
Mullins states (from the Krib);
"If you have a "high tech", densely planted, CO2 injected, VHO lit tank,
you might want to double the dose to 1/6 ml of PMDD per 10 gallons a day
(roughly 4 drops)"
For my 70 gallon tank, that translates to slightly more that 1 ml/day (2
mls/day since I use 2 solutions). I am dosing more than 11 mls\day of each
solution (20 mls total), and still showing no iron residuals. My nitrate
test is either contaminated or old, so I'm not sure what that concentration
Other tank parameters are
GH = 14
KH = 6
NO2 < 0.3
160 watts standard fluorescent lighting
CO2 - 15 to 20 ppm (from chart)
Plants include three really large sword plants (leaves 18 to 21 inches
long), 4 medium to large anubias, 40 to 50 stems of anacharis, 40 top 50
stems of bacopa, and 8 of what my LFS calls "Purple Crinkle", that is no
longer purple on the underside of the leaves.
Am I missing something here? If not, does anyone else use doses this high?
dguynn at nwol_net
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greater than himself.
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