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Has anyone observe whether an airstone or air curtain would help make the corydoras more active.

I don't have one yet - but thinking of getting one if the tank (i.e. cories ) can be a tad livelier. I've got a decent water movement already but the cories are only kicking during feeding.

ps. I have an old thread on this but need to post a new topic due to a technical problem in replying there.

http://forum.planetcatfish.com/viewtopic.php?t=707

I'm not sure about air bubbles. the air bubbles which my box filter doesn't seem to make them livelier. However, previously, i had 2 box filters in my tanks, but after taking 1 out and replacing it with a small internal power filter, all my fish are definitely more healthy. I'm pretty sure the corys don't hate the air bubbles though.

I dont think they dislike bubbles but i know mine love to swim and play with the powerhead's currents. Some days they just do nothing aswell.

i tried putting one of those long airstones in with my cories once. they loved it. they played in it all the time. if you want to entertain your fish, it's probably a good idea.
-Liz