So I got a couple of these guys the other day and I'm wondering are they sensitive to c02? One of them was spinning in circles last night then would sit on the bottom of the tank. I do run my co2 a little high. During the peek light period my ph is 6.4 and lights out in the morning it is 6.6 to 6.8. I have 0 Ammonia, 0 nitrates and no nitrites. From day one both seemed to be mouth breathers. Last night the one was breathing thru it's mouth and gills. I thought he was done for so I moved him to my 5.5g grow tank and this morning he looks better. The 5.5g tank is not cycled completely. The ammonia is .25 or a little lower. I'm new to this fish and I'm confused. Any and all suggestions are welcome.