i would like to a couple powerheads in my 40g fowlr just for some extra water flow. now this may be a super-dumb question....but although im not using an undergravel filter-can i just mount them to the walls of the tank?
one thing to add:
based on what you have in the tank,,either use , or fabricate a screen or foam block on the intake , if you have , small,slow fish, anemones close by,nudibrachs,stuff like that,,,all these and other things have been known to get the "DEATH HICKIE" from getting too close,,,,
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