Betta don't like strong currents or waves on the surface so I bought this filter to solve this conundrum. So far, so good! Cheaply made but also at a great price. Just be careful not to tear the very thin plastic it's made of. You can also glue a piece of slate (or something else heavy) to the base to give it some weight. Video. I used filter material from the original tank filter (to speed up the cycle) which was too big for this box filter. When the tank starts and I change the fill to a suitable one, the space in the lid stays open, allowing water and debris to flow better into the filter. I placed the filter in the tank I had just added soil to. a substrate that mists the water but as you can see from the video this filter cleaned the aquarium in no time! It's worth noting that the air stone that comes with it is pretty crappy and I used the better one that came with the air pump that I bought separately.
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