You have to undersand what osmoscote is and why you would want to use it in the first place.
It is a time release NPK fertilizer, nitrogen-phosphate-potassium, thats it. It contains no minerals or other nutrients. Do you want to release high levels of nitrogen and phosphate into your aquarium? People that do use it usually do in very small amounts at the bottom of your tank with several inches of substrate on top of it to prevent it from getting into the water, but every time you uproot a plant and stir things up, you are still likely to release it into the water. Getting it into the water column would very likely cause a large algae outbreak If in large enough amounts, it could raise nitrogen/ammonia to dangerous levels. Root tabs contain very little nitogen and are mostly trace mninerals.
There are two types of nutrients plants use, whats called macro nutrients and micro nutrients.
Nutrients used by plants in relatively large amounts. They are nitrogen (N), phosphorus (P), sulfur (S), calcium (Ca), magnesium (Mg) and potassium (K).
Nutrients used by plants in small amounts. They are iron (Fe), manganese (Mn), copper (Cu), zinc (Zn), molybdenum (Mo), cobalt (Co), and boron (B).
Osmoscote contains three of the macros N,P,K, and nothing else. They are three of the most important nutrients, but also two of the most dangerous if not used properly. Any garden fertilizer such as osmoscote or miracle grow is going to be NPK. It is also likely to be high in urea as a form of nitrogen which can cause problems in the aquarium.
Seachems flourish tabs are a great mix of micronutrients with some small amounts of macros, much much safer than osmoscote. And no urea. If you want to use an NPK fertilizer, use one that is low in phosphate. NPK fertilizers have a series of three sets of number 20=19=08 or 13-05-10 or whatever. The first number is N, second set is P, and the last set is K. If its a single digit number that is considered low, if its a two digit number that is considered high. So you want to find a fert that has a single digit middle number, meaning it is low in phosphate.
Robert Paul Hudson
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