I currently have an 8 gallon aquarium with a pair of very young Hippocampus Kuda seahorses (they are approximately an inch and a half) along with some macroalgae, soft coral, sponges, and a few tiny hermits and snails. This tank is approximately 2 years old, although I just got the seahorses about a week ago. There are no other fish in the tank, and the seahorses are doing very well. They are captive bred and eating frozen Mysis. I know this is a VERY small tank for seahorses (as I have raised seahorses before), and I plan on buying a 29 gallon biocube tomorrow. My question is, would it be better to cycle my new tank from scratch, or attempt to move everything over at once? I do plan to move the live rock, sponges, soft corals, and plants from the 8 gallon to the 29 along with the seahorses, but I'm not sure if it would be better to do this slowly or all at once. I don't plan on moving the sand, as I'm going to use the 8 gallon tank still for a couple of very small fish. In the past, I moved seahorses, live rocks, corals, plants, and sponges from a mature 12 gallon tank to a brand new 20 gallon tank. I did not move the sand as I thought it would recycle the tank. I bought some new live sand in a bag. Should I attempt this again, or just let the new tank stabilize and cycle over the next few months before moving everything? What would be the best route? These seahorses are still very young and small, and I don't want to stress them out.