Join Date: Apr 2012
Location: San Antonio, TX
Osomocote Plus in substrate
I started a new 29 tall and decided to try Safe-T-Sorb as a substrate instead of the pool filter sand I've been using. I sprinkled some Osmocote Plus in the bottom of the tank before adding the substrate, plants and water. I moved an established Aquaclear 50 from another tank and let it settle for a couple days. Then I tested for nitrates and was shocked to find it maxed out on the API color chart. I then tested for ammonia and nitrite and got the same results for those. Trying to find the source, I tested water from a bucket of soaking Safe-T-Sorb and got zero across the board. I put a few grains of Osmocote in a glass of water and tested the next day. No doubt in my mind now that the Osmocote is the source.
There are no fish in there, so no emergency in that regard. Should I just let this run its course as is, or should I do heavy water changes to bring this under control sooner?