So Danube has been having fun in his new habitat for the past week or so but a new behavior has popped up which sort of has me worried.
As some people have noted, some bettas seem to like to hang out in the current, and it seems that my little guy is one of those. He would hang out in plants and decorations in the current such that he doesn't have to move. He just swims hard against the current until he can perch on a plant and he anchors himself there for a while. I put the plants and decorations there so that they would lessen the impact of the HOB filter waterfall overflow current on the rest of the aquarium but he seems to spend most of his time on the side with the strong current flows.
That's just background, because now, instead of just hanging out in the current, he seems to be intent on swimming up through the current into the filter like a salmon.
Here are some pics:
It's about an inch or an inch and a half from the water surface to the top of the overflow, with a pretty decent current. The first time I heard splashing and rushed over because I thought something had blocked the filter overflow and was flooding the counter. I almost had a heart attack when I saw him in there. I turned the pump off, pulled out the filter insert and slowly poured him back into the aquarium. He has done this four or five more times since the first time and the last two times I just observed him. He seems to spend about 10 to 20 minutes in there when he jumps in, just hanging out in the bottom against the insert then coming up for some air, then hanging out again. When he wants to get out, he just floats to the surface and lets the current plop him back out into the main tank. Then he goes on about his business.
I have checked my water indicators with the API kit and they were all optimal, temp hovers 78 to 80. Aquarium content are some plastic decorations and some live plants. Plants are elodea in the gravel, floating wisteria, some sprouting betta bulbs. You can see my setup in the betta tank photos thread. Danube looks fine, no distended belly, no ick spots, no fuzzy fungus. He swims around actively and builds bubble nests.
I have tried fast current and slow current but it doesn't seem to matter. He jumps in the filter more often at night though. I can cut up a new dish sponge and maybe put it in front of the overflow so he can't jump in. The thing is that he seems to enjoy it in there.
Do you guys think I should do something to keep him from doing it? Is there something wrong with him that I just can't see? On one hand he might be hurt doing all that jumping and plopping back into the tank, on the other hand, if it's something fun for him to do, then I don't want to take that away from him.