03-29-2014, 10:14 PM
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The heat treatment is very effective. I have done it twice and I have not really had any fish die, even some heavily infested blue rams, and it worked both times. I'd also combine that with large daily water changes if you want to be certain the fish will survive - make sure new water temperature matches.
The only thing I may be concerned about is your plants. I have never treated an aquarium with them and I hear they can be sensitive to heat... Especially crypts so you may want to look into this. I did look into it some in the past and it seems most people just had some plant die off (partially melting) but nothing major, the plants recovered. But you may want to double check and do your own research.
Your water hardness and pH shouldn't be a problem. Many resources like to say that your pH and hardness is too high IN GENERAL, but for some fish, like platies, it's perfect and the neon tetras and cories should adapt just fine.
Anyways, consider the heat treatment. In the past, as soon as I turned the temp up to 86F, I noticed hardly any new spots develop for about a few days, and then once those spots were gone I never saw the ich again.