We all have our dislikes about this hobby at times or even all the time.. could be keeping curtain or all prams in check, WC's. Ich., pests, cost of stuff ..ect.. I have a few but right now mine is trying to keep Nitrates down.. It don't matter how many WC's I do plus doing all the right things like not over feeding, rinse all frozen foods with RO/DI added a fudge with a good amount of chaeto but it's still high and i can't figure out why.. what's yours?