09-17-2011, 08:06 AM
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No, HOB filters (hang on back) are better by far than sponge filters but having said that, sponge filters are much better for fry tanks because there are no tubes that the fry can get sucked into, and that's what happened to the baby Molly I mentioned in the previous post. Sponge filters are just a circular black sponge with an air hose attached, any junk in the water is soaked up by the sponge which has to be rinsed out once a week or so, they are very basic and should only be used for fry which don't pollute the water much anyway. If you look very closely at the pic I posted of my fry, you can just make out the sponge filter on the middle.