Anything is possible. get some buckets to put the animals in. drain off some aquarium water into the buckets and the rest into a container. move your substrait, rocks and equipement to the new tank, put the old water back in and complete the top off with preseasoned salt water. turn every thing on and let the system clear. put your animals back in by acclimating as you would if they just came from the pet store. no garuntees on no losses, anything can go wrong. maybe others will weight in here also. good luck.