I have 29g and I noticed ONE of the fish had several spots. I couldn't see any the day before, which is weird. I know it's ich 100% so I went out and bought imaginarium ich treatment. I dosed it accordingly & so far I've lost two angelfish, one hatchet fish(super old), & a platy. These fish in the tank weren't even showing signs of ich & were 100% healthy. I still have a few fish & there and I'm not even sure if I should keep treating. This tank has been cycled & running for a VERY long time btw so the only thing that I can think of killing them is the treatment. I bought Ich-X online but it hasn't arrived yet & the ich on my one fish looked super bad so I started treating with the imaginarium. How should I switch them over to the Ich-X? I've already done water changes because 4 of my fish passed away, but I re-dosed & waited a day after that.