Currently I have a jbj 12 gallon nano cube with 2 erectus seahorses in it, 2 Gobys and a bunch of snails. They're growing out of the tank fairly quick and seen a biocube for sale locally, the tank is running but I'm wondering if I can keep the sand they have in the tank, use my water and rock and transfer everything over in a day. They have rock in the tank but it looks like base rock and possibly mid cycle so I was going to introduce 1 rock at a time to be safe ?