I would not. Terrestrial plants require somewhat different nutrients and in different proportions than aquatic plants. I would never use terrestrial plant fertilizer of any sort in an aquarium. You could be adding too much of some nutrients that will cause algae and other issues. Terrestrial plants require nitrates as their nitrogen source, whereas aquatic plants require ammonium (ammonia) for one thing. Not worth the risk.
not by themselves, no. I have used them in the past as part of a regimine because they are cheep and available fertilizer. The main idea behind it was to add phosphates from the substrait as opposed to from the top of the water. They must be used in small amounts and augmented with additional fertilizers. My feeling was that they desolve too fast and some of the chemicals can be harmfull to your fish in anything but the slightest concentrations. Plus I dont have any problems with adding phophate directly to the water so why worry about it.
I've used pond fertiliser in my tanks, but decided to stop when I got some of it wet and it produced fumes that smelled identical to windex.
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