tank is 100 gallons tankmates: african yellow belly hippo, two black occ. clowns, two blue damsels, sixline wrasse, lawnmower blenny, cleaner shrimp, about 10 snails, 5 emerald crabs (had 20 before tank busted but took them out because they were eating all my polyps), 5 hermies. i feed them pellets twice a week and once a week shrimp which i rinse off and put red sea veggies in three times a week. have about 10 diff corals mostly lps but some sps and lots of zoas palys and shrooms which everything seems to be growing rapidly. water quality: PH- 7.8 nitrite- 0 amm- 0 nitrate- 0 phosphate- .25 cal- 440 water flow- two aqueon 1250 pumps and two wave makers coming from return pump. do water changes every week at 20% and use ro/di water for top off run carbon clean sump twice a month have two balls of chaeto and 5 mangroves lighting- 6 VHO t12s (5 months old) now thats out the way i have had the tank since august 2010, in november of 2010 the tank split apart and leaked out...bla bla bla bla... got a new tank and set it up same day and it has been running ever since. so i guess we can say the tank is 2 months or so old now. i never had any problem with cyano before the tank busted and now i cant seem to get rid of it i had it for a month now and it covers my sand bed but not so much on my rocks and corals just the sand where ever the light can get too. i cut down my lighting to 9 hours a day now from 12 and it seemed to help a little and siphon what i can out with water changes (sand bed went from 4"s to about 2"s now with all the siphon). so what gives.. do i wait it out and wait for it to go away or do i take what my LFS gave me (red slime remover) and dump that in which i really dont want to do. is this normal for a tank this young? its ugly and i want clean sand so any advice is appreciated.