Help, found a dead CRS in my tank
Yesterday afternoon I did a 25% water change to my 10 gallon tank, the drop checker was originally blue and shifted to a yellow-green color. I then turned off the CO2 tank. This evening I noticed it had turned back to green, but I found one of my crystal red shrimp dead. Please help me to identify the problem, I'm thinking its because of the major water change.. Also what would be the best way to get my tank more oxygenated thanks!