I have a single albino kribensis in my tank with other american cichlids. I have made various hide outs in the tank. The krib has occupied one of them and keeps in it. I have noticed something strange. I takes out a few grains of gravel from inside the hideout and spits it out. By doing so it has made a really deep well inside the hideout. what is it trying to do? it is other wise not stressed and is also feeding properly.