I brought home a betta Sunday night. Today is the 3rd day it's been with me. It lives in a 5 gallon tank. the water was conditioned and temp. is at 78 constant. I haven't cycled the water as i plan to change the water regularly. Today morning when I checked on it, it seemed to be fine and perky (I have been watching it closely). But about 20 minutes later, I noticed it would go to the bottom of the tank and rest on the pebbles for a minute or 2 and then rise up again. I watched it do this for about 3 - 4 times in a span of 20 odd minutes. Is this cause for worry? Anything I can do?