Because my well water has a nitrate concentration of 20 ppm I plumbed a nitrate filter into the cold water faucet of one of my sinks near the tanks. I use a python to deliver nitrate-free water, almost. The cold water temperature is about 64 degrees F. So I add a little unfiltered hot water to the nitrate-free water to deliver water to the tanks with a temp of 77 degrees F. This of course adds some nitrate. My tank heaters are set to 77 degrees.
I did an experiment today adding only nitrate-free cold water to a 29 gallon and 60 gallon tank. This was a 25% water change for each tank. The tank temperature after the exchange fell from 77 to 73 degrees. In the 60 gallon tank I have a. thomasi, a. caudalis and p. pulcher. In the 29 gallon tank I have several species of livebearers. Do you think a 4 degree drop in temperature over 45 minute water delivery period puts the fish in danger?
I did an experiment today adding only nitrate-free cold water to a 29 gallon and 60 gallon tank. This was a 25% water change for each tank. The tank temperature after the exchange fell from 77 to 73 degrees. In the 60 gallon tank I have a. thomasi, a. caudalis and p. pulcher. In the 29 gallon tank I have several species of livebearers. Do you think a 4 degree drop in temperature over 45 minute water delivery period puts the fish in danger?