5.5 Gallon Betta tank

I set back up my 2.5 gallon tank and moved my super red halfmoon to it. I impulse bought a giant betta a few days ago cause he was gorgeous. He made his home in the 5.5 gallon I put him in.
Tank is cloudy and the sponge filter isn’t working like the one in the other 5.5. I threw a filter onto the tank and it’s helped a bit, may pick up a slightly larger filter.

He’s a Giant Red Galaxy Koi. He’s been active since day one.
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