Planted Tank Guru
Join Date: Jan 2010
Location: Contra Costa CA
Bury the capsules to the bottom of the tank so the water flow through the substrate will not release the fertilizer too fast, and just use a few the first time. Monitor the water. Sometimes you can find traces of ammonia from these, especially if you apply too many or do not bury them deeply.
You can make your own, too. Osmocote Plus is a garden product. The gel caps can be purchased on line, or in vitamin or health food stores. I believe the 00 (double zero) size is correct.