Current temp is 75˚.
I just started doing water changes with RO/DI water mixed with regular tap water within the past few weeks. I top off with RO/DI water daily, about 1/3 gallon.
It is possible that the flow in my tank has to change a bit. I'm going to move the powerhead back to the same side as my filter output and see how everything goes over the next few weeks. I'm also going to try to get rid of as much of it as I can this weekend during my usual WC.