Hi. I have set up a new breeder tank and my 15 Hongi fish arrive Thursday this week. It's a little earlier than I wanted but the supplier have the fish now and may not have in a few weeks. I have all the rock for my tank but I don't have the sand yet. Not wanting to miss out on getting the fish I want I want to know if they will be ok with a bare bottom tank with rock for a few weeks? After that I will get my sand and add the substrate with as little upset to my new fish as Possible.