i have shown this before and i know someone who has done it with no problem. i have a 55 gal. established for 10 months and a 30 gal. acrylic and if i have only crushed coral and fresh saltwater in the 30 wouldnt it be just like doing a water change or do we need to take bacteria into consideration, and if so could i use "cycle" bacteria to help at the start. basically trying to have 2 show tanks for different species and adding 30 gallons of volume. any experienced comments welcome. see attachement 