You're going to have to treat the tank if you want all your fish to live. Ick is apparently in your tank and going through it's life cycles, and your other fish will catch it. So removing the two tems will be useless. You will have to salt the tank, just add less than recommended. Or remove and bleach the plants, and add them to another tank, then treat the 210 with salt, but you should atleast increase the temp to 86 F.