Good question, IMHO it depends on your filtration system. Ive currently got 2 FX5s on the tank I might switch out to tile hence I am pretty confident that my bacteria colony will survive.
You thinking about doing this? Whats your filtration like? Tank size?[/quote]
Right now i have a 300 gal (6x5x17.5) ray tank with 2 FX5's and a Lifeguard Fluidized bed filter.. Both my FX5's are filled with bio rings and bed filter is filled with sand.. And all has been up and running for a year or so..