My 75 gallon soft coral tank came down with marine velvet. Most of the fish died but the 2 that did not have been removed. I am planning on fallowing the tank for 60 to 90 days. How do I maintain my nitrifying bacteria during this period? I am continuing to add frozen mysis shrimp for the inverts and corals hoping that this will be enough to keep the bacteria alive. Should I be dosing ammonia?