i have a 30 gallon planted low tech tank and i recently just battled an outbreak of ich. i used the high heat and salt method and everything was fine. i raised the temp to 80 and i mixed in a ratio of 1 teaspoon of salt per gallon, so a total of 30 teaspoons. i had different hygros, vals, wisteria, sag, and crypts in there, along with tetras. i think the main key is to add the salt solution to ur tank slowly so the fish have time to acclimate. fortunately for me, i work in a vet clinic, so i just took an empty IV bag, filled it with the salt solution, and let it slowly drip into the tank over the course of 2 days. there was no noticeable ich on any fish after about 5 days. but i didnt change the water for another 7 days after the last sign of ich, for safety measure. i think the plants and fish were stressed only a little bit. plants didnt grow as well and fish didnt seem to swim as much. but nothing detrimental to them. hope this helps.