Filter rides!

[mtmichaelson]

I have a Cascade 1000 on a 54 gallon corner tank. It houses just 1 6 inch lotl. He seems to enjoy swimming close to the filter return and riding the suction backwards. He swims back forward and does it again. Is this something to be concerned with or fairly normal?

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[Otterwoman]

I have heard of this type of behavior before, newts/sals playing in bubbles, playing near filters.