I use the Cascade 600 internal filter and it works very well and efficiently. I have a 15 gallon tank and every two months I break the tank down completely. In between, all that is needed is to rinse the filter out well and place back and add some biodegradable waste reducer and something to dechlorinate when the water is first changed, and you will get a longer life out of the filter. Be careful when placing it in the aquarium or terrarium that the filter is placed lying down and submerged.

Pros: Filter is quick and powerful

Cons: Set it in the tank carefully

I love my cascade filter it is very easy to break down and clean. I use it in a40 gallon breeder tank for my turtle. this is the only filter system I have found that has ever kept my turtles water sparkling.

Pros: Easy to set up and use

Cons: none

good for large aquariums

Pros: cleans

Cons: needs to be cleaned