About a month ago I noticed that the water in my 12G long is just a touch milky. I cleaned the glass and did a 50% WC in the eve. The next day - water is milky again. After a couple of 50% WCs, I added an UV sterilizer. Water cleared up back to crystal in 2 days. So, I assumed I had a bacterial bloom.
About a month later of no issues, last night, I pulled a couple of red tiger lotuses out, cleared 1 of the 2
filters, did 50% WC and turned off the UV. All WCs are done with Prime added before water is added to the tank.
This morning the water is back to milky and the C. Habrosus that was swimming in the current last night was dead on substrate.
Everything, including N is at 0. The tank is heavily planted, been up for about a year now, pressurized CO2, high light, 2 filters with pretty decent water agitation. It houses a bunch of RCS, Ram snails, 2 black molies and, now, 3 micro cories.
I have been losing micro cories in that tank over the last 6 months: no bodies, no nothing, all water params are at 0, at 78F, 6.8 pH, ~300ppm TDS, ~6 GH, ~3 KH. Shrimps and snails are multiplying by leaps and bounds. Mollies are fat.
Anything that I am overlooking?