I used my spare 10g tank for the fish in the 20g. Drain tank water into your spare tank and transfer the fish. Hook up your filter and heater to the spare tank and the fish will be fine.I'm more apprehensive about relocating the fish to a temp home while I change the substrate. I might actually get a smaller tank, perhaps 55 gallon. While I have a large house, the 125 takes a lot of space and limits where I can place it.
Never hurts to do a WC...Pet store only had ph kit in stock for fresh water and plenty all in one for saltwater that won't do me any good. My water has cleared up somewhat. my pleco and Cory's are good, yay! So should I drain some more water out and fill back up? Or fill the remaining say 5"-6" from full. Or just leave it alone until I get the test kit in the mail probably tomorrow or Wednesday? I have a bow front 55 gallon btw.
I drained half the water. And the picture it what it is now. It looks clearer that what it really isCan you tell us how approximately much water you drained, and how much fresh you added? This may help the analysis.
i.e. Did you drain 75% and then add 25% (of the tank volume)? This would leave you half full and equivalent to a 50% WC.