Interesting topic I have never gave much thought to why fish yawn. CHC, is nitrates really the culprit or was that a guess? Also, how can nitrates be 0 with only 25% wc once a week? Im assuming those tin foils eat a ton as well?
dont know about the yawning, but you may want to up the 25% to 50%wc and also upgrade to an ac 110 if you have the means. check the classifieds here daily and you may be able to find one for a real reasonable price.
