ok. we changed the carbon/phosphate filter today on my dads 125g. we had a cyano outbreak in his refug so we figured eliminate a possible food source for cyano (phosphates). oh, he also did a 25g water change.. anyways about 15 minutes later his sailfin tang started swimming around in weird ways we have never seen him swim, and he started doing a backflip several times, so i suggested to my dad to turn off the carbon/phosphate sponge filtering..do we need to be absolutly concerned at this point, or should we continue with the filtering?