Quote:
Originally Posted by seaflo
 Old man; great info. I have seen many posts on other forums and through the net that say Coco is an active medium and has particulars that must be rigorously observed/monitored. I am just going to jump in and try it. I plan on having 8L pots with a 4 to 1 mix of perlite and coco. I will pre-treat the coco with CalMag and PHed RO water (5.6 - 5.8). I am placing hydroton in the bottom of the pots for drainage. I have a few clones ready to go in. I am using Weedhound's nute recipe and schedule (the one posted on Cannabis.com's forum, which has been down for over a week; anyone know what's up?).
I cannot afford to buy new nutes now  so I am using the PBP, ST, CalMag, H2O2 3%, LK & Hygrozyme. I will place them under CFLs for veg.
There seems to be a varied way to check PH in Coco; some say use the runoff and others say to test at roots w/ soil probe. Old Man what do you suggest? 
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My Comments:
"Coco is an active medium and has particulars that must be rigorously observed/monitored"
Actually, it's easier to manage than soil.
"I will pre-treat the coco with CalMag"
It won't do any harm, but it's not needed if your ferts are any good.
"I am using Weedhound's nute recipe. . .I cannot afford to buy new nutes now."
You'd probably do better with store-bought nutes. We're talking less than thirty bucks for Flora Nova, which will probably last you more than one cycle. Start out at 1/2 strength and slowly increase the strength. Pay attention to you tomato plants.
"There seems to be a varied way to check PH in Coco; some say use the runoff and others say to test at roots w/ soil probe."
Ignore the runoff. As long as your nutes are properly PH'd, you'll have no problem.
Remember, coco is not soil. You must water it every day with properly PD'd nute solution with AT LEAST 10% run off and you'll be good to go.
Good luck with those tomatos.