Just remember that super overdoses of amm (as kornphlake said) and CO2 can kill the biofilter bacteria as well. So if you're planning on saving the tank from algae destruction due to high ammonia levels, CO2 is probably not the answer since it'll likely result in the tank cycling again depending how high you go with it. Bacteria breath oxygen, too.
Removing the plants and treating outside the tank probably won't solve your problem either if your leeches and whatnot are in the substrate. Why not try Levamisole? It kills nematodes, safe for snails, plants and fish. Not sure about leeches, planaria etc, something to consider and research.
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