What the heck do these guys eat? I admit, they were an impulse buy, lol. So cute! But they won't eat anything, and I have had them for about 2 days already. Just worried. I tried Hikari Algae wafers, bloodworms, and flake food. Last ditch effort will be frozen brine shrimp. I have no access to live foods, so any advise at all would be appreciated. Thanks!