I decided to post this in the sps section because I wanted to know what percentage of water change and how often has given you the best results for your SPS?
For me im currently doing 10 percent water changes every week.
10% weekly on my SPS tank. I use a shop vac to suck up all the crap that settles in the sump. Works fantastically well. on my smaller tanks, 50% weekly to biweekly. On the pico 80% weekly or things start to go south...
I used to do 10% - 15% weekly on a 30 gal cube, but after I started dosing vodka,
I now change the same amount every other week plus I've doubled the feeding amount.