about my tank
tank size is 36 by 18 by 18 inch, setup since 1st jan 2003, using overflow system , biohome,coralchips and ceramic,
1) 2 flame goby
2) 1 baby yellow trevally
3) 1medium size blue face angel (3inch)
4) 1 purple anthias
5) 1 gramma
6) 1 baby emperor angel
7) 1 medium size purple tang
8) 1 clown fish
9) 1 small blue tang
30kg of live rocks
red sea protein skimmer
do not know what 'live sand' is but bought and use 2 bag of sand
ph- 8.0
nitrite-0
ammonia-0
calcium 400mg/l
nitrate - 50mg/l(high)
please advised