Zoo Med Turtle Clean 318 Submersible Filter

Wasn't sure if I was going to like this little filter but I really do. The main compartment has a sponge that works well for growing the beneficial bacteria you need for your tank to cycle & I like the 2 little additional compartments that you can customize with your own choice of media. One of them has another sponge but you can do something different in either if you choose.
The flow rate is adjustable as well which is nice. The description says you can use it in tanks up to 30 gallons but I think that's a bit much. 55gph can only do so much. I think a 10 gallon tank would be as much as it could handle by itself. I'm cycling it right now in my big goldfish tank & after that I'll use it in a 5 gallon I'm setting up for a Betta. Should work just fine!

Best I've found! I've been using this small filter for several years for my approx 35 to 40 gal pond which is built into the floor of my screened porch. We have a red-eared slider who is approximately 15 years old & she can get pretty messy. The pond is outside & I heat & cover it if temp falls below 50 in winter (Florida).

After frustration with the short life span on a couple very expensive large filter setups I found the Zoo Med. It has worked well, the replacement filters are very reasonable & it could even be used with a small fountain attachment except that our turtle doesn't like splashing. :-) I would highly recommend it! If my pond was 2x the size, I would consider 2 of these rather than the large out of water filters.