I've had my 3 12" endlis from Toyin now for about 2 months. They've been doing great... eating well, getting bigger, moving around. Two of them would usually come to the surface to look for the dry krill I give to my Arowana. One of them would never go to the surface except to gulp air. This one would usually gobble up most of the Hikari sinking carnivore pellets. The last two days, the same endli that never goes to the surface has not eaten a bite (that I've seen). Well I read enough of the stickies on eating that I'm not woried about that. What concerns me is that this endli suddenly is spending time floating at the surface of the tank. I floated some dry krill right by it and it showed no intrest. Sorry about the long winded intro, but I guess my question is, is this floating behavior something to to worry about or just a change of pace for the fish? By the way the other two endlis are acting perfectly normal. Water conditions based on my test kit indicate Ph 7.5 Amonia "good" Nitrates "low". I'm doing weekly 15% water chages (siphoning the gravel bi-weekly). The tank is 225 gal and none of the fish show any signs of fighting or illness.