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I am wondering if anyone else has noticed this behavior. I have a group of eleven adult Corydoras trilineatus in a ten with a matten filter, tons of plants, leaf litter and structure. They are over an inch and a half of sand. I feed blackworms to the point that the corries can't eat them all at once and the worms get in the sand. Tonight as I was watching the tank they all lined up on one side of the tank and with their faces pressed against the glass began franticly fanning their tails. They fanned until they had fanned about and inch of the sand away and then turned around and started nosing through the remaining inch of sand for the worms they had exposed. I was impressed.

Sounds like you got to see something great.

Marine590622 wrote:I am wondering if anyone else has noticed this behavior. I have a group of eleven adult Corydoras trilineatus in a ten with a matten filter, tons of plants, leaf litter and structure. They are over an inch and a half of sand. I feed blackworms to the point that the corries can't eat them all at once and the worms get in the sand. Tonight as I was watching the tank they all lined up on one side of the tank and with their faces pressed against the glass began franticly fanning their tails. The fanned until they had fanned about and inch of the sand away and then turned around and started nosing through the remaining inch of sand for the worms they had exposed. I was impressed.

hahaha that's really great !!! Smart fish they are !

wow thats amazing if they do it again. use your phone or camera to film it

I use less than 1/4" layer of fine sand in Corydoras tanks so they can eat most of the black work that otherwise tend to escape and establish colonies. Using a very thin layer of sand doesn't prevent all escapes and colonization by the black worms but it is a more efficient way to use this expensive live food. I pot all rooted plants.

I have been trying out different setups from barebottom, to just a dusting to 1/2 and up to 1.5 inches of sand.