Hey guys I'm wondering if I could possibly be causing dkh swings in my tank by doing 5g water changes every week in my 20g long reef tank. Everything looks fine but when I do my water changes my euphyllia shrinks up for about a day and then back to normal again. Is this normal?? I just want to get a routine down and not change it. I have a 20g long I use red sea coral pro and mix it myself with RODI water. Every week I mix it up to 1.025 Salinity and wait for PH to stableizie the do a 25% water change.(some people have said they think that is excessive). What do you guys think I have mainly LPS and soft corals and maybe 2 or 3 SPS. I feed the fish once a day,(I have 3 different types of frozen food that I switch off feeding) and then once a week feed my corals with reef roids, marine snow and fuel all mixed together.