200 gallon tank 78 degrees , tanks been set up with the same fish for over 9 months.. 5 inch jack Dempsey 14 inch arrowana and a school of 3 inch silver dollars , got two HOB marine land max size filters and a Fx6 canister no plants in tank no medium just 3 fake plants and a cave and some tiles on the bottom on one side for the pleco PH is around 7 don’t have anyway of testing anything else.. all over fish are fine even the Oscar acts fine just has the mark on the eye. Sorry I am very new too this site and fish keeping in general always had tanks but currently have 5 tanks Flowerhorn, wolf fish etc. all seperate tanks the 200 is my only community tank