yo many people say that red-tailed sharks shouldn't be 2 together on a 10 gallon tnak cause they will fight, but not really..it's been like a day and they get alomg just fine. No figting. But one of them acts werid. Well both of them do. I got this lil shipwreck in mah tank and a tall Pagoda. One of them stays like isolated in the pagoda and the other like stays near the shipwreck. Sometimes they follow each other and juss , well do nothing. Stay together. But on of them acts kinda funny. He' or she keeps on doing like these spins or wha ever in the water.. i thought they were dying at first but they do it like all the time. And they seem pretty healthy...any thing u have to say??