I have a 7 month old, 6 gallon tank which I decided to start aquascaping on about 3 months ago. I took off my fish and moved them to another tank in order to be on the safe side. On the 6 gallon tank I have a Finnex PX 360 filter, since my plants weren't doing so great I updated my lighting to a retrofit Metal Halide light and the plants are awesome and healthy; however, I developed both hair algae and my water turns brown within a couple of hrs of doing a water change. To try and combat the free floating algae I installed 4 days ago a CORALIFE TURBO TWIST 3X 9 W UV
Sterilizer and a Pacific Coast CL
-85 Nano Thermal Chiller/Heater so the temperature would not fluctuate too much because of the high amount of light. I have been testing the water regularly using API master test kit and doing 20% weekly water change. My parameters are as follow:
Last night I introduced one of my black mollies to the tank and this morning it was dead, I tested my water again everything checked out like usual so I put one of my tetras in and it was fine for about 3 minutes and then started going to the surface gasping for air and turning vertically. Needless to say I took her out and she is happily swimming in my other tank. I really don't know what the heck is going on. Someone please help.