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Filter Currents: A Betta's Worst Nightmare (HOB filters)
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Joined: 09 Jul 2006
Location: Calgary, AB

PostPosted: 2009.04.24(Fri)19:10    Post subject: Filter Currents: A Betta's Worst Nightmare (HOB filters) Reply with quote

A lot of people on this forum have bettas, and the question of what to do about the filter current comes up quite often, especially with respect to HOB filters.

I just came across this link today on another forum and thought I would share the DIY solution if your HOB creates too much current (even at its lowest setting):

And just in case that page ever disappears:
[Hang-on-back filters] typically have a 'waterfall-outlet,' where the water falls down out of the filter into the tank. The obvious problem is that as the water falls from the outlet, it accelerates under the force of gravity until it reaches the waterline, then creating a strong current.

The secret to stopping the current is to simply obstruct it. The most efficient way to do this is to use the body of a half-liter soda bottle. I will now describe how to construct the device.

Step 1: Start the incision...
You must first cut the soda bottle appropriately to prepare it for mounting. You must remove the two ends of the bottle, leaving only a smooth cylinder from the center of the bottle. Next, you need to tear off the label and cut the cylinder along its length, right next to the strip of glue. You should now have a simple sheet of curled-up plastic.

Step 2: Duct Tape and BubbleGum
This step is very simple: simply tape one end of your plastic sheet - the end with the glue on it - to the top of the filter, and bring the other end around under the outflow.

What color is your straitjacket?
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