When I was starting, I used the seios but they didnt seem strong enough, so I went to Koralias. I used 2-4s in my 75 and then used 2-4s and a 3 in my 120. I use 2-magnum 6s in my 180. Close to being too strong. In 3 1/2 years never a problem with my koralias. Actually Charlene is using my 4s in one of her tanks. No problems.
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