Low KH, High GH, Cloudy, Acidic Tank...help
I just joined the forum although I have been reading for years. Always great info so I thought I'd see if anyone had any recommendations for me. I have a 29gl freshwater tank. Has been established for several years. Assortment of tetras, cory cats, algae eaters, and one lone gourami. Plants consist of java ferns and amazon swords. 2 pieces of driftwood in tank. Unique point: I use a UGF for my tank as it was established when I started keeping plants and while not the ideal it works great...at least until this past week.
Back story: due to life happening, ended up going a little too long between cleanings, nothing horrible but had gotten to that stage where you're like "I need to clean the tank". So approximately 4 weeks? After cleaning, normal floating debris resulting from filtering substrate with vacuum, key word being normal. That was four days ago. I have since done two-three 25% water changes in an effort to get the water to clear up and it is still beyond cloudy with a slight greenish tint. Tested all levels of everything using API liquid. Results: 0 ammonia, 0 nitrate, 0 nitrite, low KH, high GH (as in not even on chart high), very acidic water. Crazy thing? Fish are totally normal and happy.
My water is hard which is something I have always dealt with. Acidic water is totally new and I have NOT knowingly done anything to it to make it so. Water in tank vs. water out of tap totally different ph wise. I do use tap water in my tank. Always have.
Any ideas what would be causing cloudiness? I did have an out break of black beard algae (horrible stuff) but that was months ago and is about 88% eradicated. Ideas on issues of acidity and how to correct/rebalance?