I just got back to doing them every week, I went on sabbatical from doing it for a bit and regret it. 5 gl… It’s easy enough on my 55-60 gl system. I’ve looked into dosing to avoid water changes, seems like a lot of extra equipment to get when it literally only takes me 15 min every Sunday. Take looks great now, especially after vacuuming out the sump which I hadn’t done in 7 yrs. Terrible I know, that was a 15gl water change, easy peasy. Like night and day now. Doing the 5gl weekly wc I use a 3/8 hose and siphon up any algae and detritus. Tank looks even better. Maybe look into dosing equipment when and if I ever upgrade to a bigger tank or if my corals start consuming more nutrients then the weekly change replenishes. Haven’t seen any numbers drop in the past couple months. Like chrispchef said, I actually enjoy it.