We have a 75 gallon tank- running for about 3 weeks. It was set up using media & decorations from a previously established tank. Cascade 1000 canister filter, AquaClear 70 HOB filter, 2 150watt heaters & 2 large air stones. We have the following fish: 6 (3 albino, 3 green) cory cats, 2 rubber lip plecos, 1 albino bristle nose pleco, 11 zebra danios, 6 platys, 2 Angels. 3 days ago, we added 15 Cardinal tetras which have since died off 1 by 1 - as of this morning, we only have 4 left. Yesterday, I noticed what I believe is ich on both of the rubber lip plecos & the remaining tetras. I have researched & would prefer to treat with heat, but I am concerned about the cory cats tolerating the warmer 85-86 degree temp for so many days. I understand that the medication can also be problematic for the cories & plecos. Any thoughts or advise? I did buy Marineland brand ich treatment yesterday, but have not used it yet. I have not seen any of the white spots on the platys, but I have noticed that they seem to be diving & rubbing/scratching? on the driftwood & other tank decorations. All of the other fish seem to be doing fine. 25% water change done 48 hours ago. Water parameters with API test kit last night were: ammonia 0, nitrite 0, nitrate 20, ph 7.8-8.0. Thanks in advance for any advice!
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