Help i think my oscar has hole in the head disease

[cacichlids]

yea i know the tank is too small that is why it says in a 30 gallon tank FOR NOW. i dont have a test kit i will go get one and test the water. thank you for all the help i will start doing more frequent water changes.

but your 5 inch Oscar is already way too big for a 30 gal, let alone with a 7 inch Jack Dempsey. AND you don't have a test kit... it's like a recipe for HITH lol

50% daily water changes and feed as little as possible are your best bet