I have a Koralia 3 I believe and it does blow a bit of my sand around in the front left but its not so bad. I had two Koralia 3's but that was overkill on my softies.
My Koralia only runs when the daylights are on so my fish can get some more restful rest at night. Also the Koralia comes with a little attachment that you can attach to give it more directional flow so its not disperesed so bad.
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