Just found another oto dead and another one not looking good. Thinking they might be sensitive to the meds, puple-ish discoloration around the gills, throat etc. there are supposed to be 2 more otos that I can’t find. Just did a 30% wc to try and dilute the meds, with a gravel vac (difficult in a planted tank). I worked out the Paraguard dosage very carefully, and always treat new water with Prime. I am supposed to use the Paraguard for 2 weeks, but could I perhaps use a 50% dosage? I haven’t added meds yet today.