Hello I have a 14.5 fluval evo and I’d like to know how I can best go about replacing my old rock that is hard to get clean with new caribsea life rock. I’ve had the same rock in it for over 2 years now. There is no coral in the tank just a small snowflake eel. Will I have to introduce the rock slowly while keeping the old rock in the tank? I don’t want to mess my parameters up because of the eel of course but would really like to have a nicer aquascape to look at. TIA.