I've used the carlson devices on different sized tanks.
Pros:
- Kind of a neat way to get some flow - it's not that great
- Fun to tinker and build
Cons:
- Lots of micro-bubbles
- Loud
- Pain in the ass to make and have setup above and beside your aquarium
- Cost just as much as a powerhead, except it's a pain in the ass
- Pain in the ass
- Looks ghetto
I think you know which option I voted for.
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