i have a 125 gallon tank, with 4 medium tnags, hippo, yellow, fox, and sailfin, two clowns and 2 black domino damsels. its a fairly old tank as i got it used from someone, but has been in salt water for the past year and a half. my PH is 8.8, and my ammonia is zero, while my nitrate showed the second lowest reading on the color chart. my tank is mostly lps and zenia's with some zoos and star polyps. i feed twice a day, once in the morning and once at night. i have a good amount of snails in there and shrimps, but they dont seem to be able to eat enough or clean it enough. none of the cleaners even puts a dent in the cyno. i usually have to resort to scrubbing.