hey alll i started my tank on saturday it has 20lbs of sustrate not live and 18lbs of "cured" live rock (the lfs said it was cured). YEsterday i went out and was told to get Dr. tims one and only...its a BActeria agent u dump into the water. on the bottle it says add fish imediately so i added my gsp. this is my 1st sw tank its a 55gallon tank..the gsp seems ok his belly got alot whiter then it was before i switched him to full marine. and he is eating. i check the nitrite today and they are at .3...i have 10gallons of sw mixed and ready to go should i do a water change??