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No matter what soil you use, add 20% perlite to the soil..(mix well)..in pots with very good drainage holes. The water should go in the top and mostly all drain out, within 30 minutes.
Then, don't water again until it's bone dry. Smaller 2 gallon pots for example dry out pretty quick with fast growing plants. 5 gallon pots might stay wet for a week?...or more...especially with weak lighting.
I agree dutch, I also take back what i said about this soil, it seems to do the trick. I must have had a nute sensitive strain going but once it got a little bigger it took fine to the soil. I added some pics to the my album thing if you want to check that plant out that I posted earlier. I started a new plant and treated it the same and the results are great so far, one of the most vigorous growing plants I have ever had!