Join Date: Apr 2016
Location: Central New York, USA
Many/most terrestrial fertilizers use urea which results in a significant ammonia spike when used in an aquarium. Osmocote and others are slow release in soil, but not in water and it's even worse if the gel cap is not pushed very deep in the substrate. The resulting ammonia spike may be tolerated by plants, but may not by fish!!!
Frankly, for the sake of fish, although more expensive, modest use of root tabs designed for aquarium plants is perhaps a better investment.
Also, as your plants grow and you effectively have more plants, you may need to up your fert dose to accommodate their growing needs - even though some plants are technically 'root feeders', ferts in the water column will also fertilize these plants.
Tank On, Mike-
60g Marineland Community, Finnex Planted+ 24/7, Silica (pool filter) sand.
10g, 29g, & 37g fry grow out tanks, 110g stock tank.
What came first, the chicken or the egg. It was the egg, but not the egg from a chicken.
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