I have a 29 gal Bio Cube.144watt light up grade,CPR skimmer. 30+ Lbs.LR two fish,lots of mushrooms,polyps,lps/sps. Been running for 1 1/2 years.Is changeing water,2 1/2 gal. every other day too much. I try not to use too many additives. Water tests 8.1 to 8.4, alk 260+, salinity .225/.226 all...