i got some ocean nutritin formula two food the frozen cubes should i break it up before putting it in the tank or just put the hole cube in or please tell me what i should do i only have a yellow tang and 1 damsel in the tank i want to order from dr. foster and smith like 3 more fish and some invertibrets i want to put them in my 20g QT tank before the main tank will that be ok and if it is how long should i leave them in there and will this be to many fish to add at one time or will it be ok thanks a lot this site is great i appreciate all the help i have gotten here