Betta Behavior changing?
When I first bought my 5-gallon tank, all I had was the tank, gravel, and filter for my betta (along with the sample water conditioner and sample flake food that came with the tank). This is what my betta was first introduced to. The sample of conditioner was only enough for the initial set-up so two weeks after the set-up, I bought API tap water conditioner and a 50 watt heater along with a thermometer and a cave decoration. This is when I did my first water change and ever since that water change, my betta has been acting differently than before. Before, it swimmed around a lot and explored the entire tank. For some reason now, I noticed that it sometimes positions itself below the 1-inch gap between the bottom of the heater's rubber cap at the end and the gravel. It is set up in the back corner and it doesn't seem to be comfortable. It hides inside the cave sometimes which doesn't seem to be such a problem since that is what it is for. When I turn on the aquarium light or even just enter the room, the betta snaps into action. Does this behavior seem unusual or even something to worry about?