DIY Sponge Filter...

[spittinfly]

I thought you put a sponge filter on a line to keep fry from getting sucked up. So if the opening on top above the hose end is big enough for fry to swim down, and the end of the hose isn't plugged into the sponge couldn't the fry swim down the tube and get sucked up the hose? I got some fry and man are they curious.

[dskidmore]

Originally Posted by spittinfly

I thought you put a sponge filter on a line to keep fry from getting sucked up.

There are two kinds of sponge filters. It sounds like you're describing a prefilter, that slips over the intake of a more powerful filter and prevents fry from getting sucked up. This is just a stand alone sponge filter. You stick an air line to the bottom of that tube, and the rising air creates a current of water going into the sponge, up the tube, and out the 45 degree elbow. There's no impeller for fry to get chopped up in.

[spittinfly]

I see, so that is an air pump line not a suction line. Very interesting. Looks like a great design and very easy to build/use. I will have to keep it in mind. Thanks for the clarification.