Black worms that turn into small flies

[Ice222]

I've been noticing small flying bugs near my tank. The tanks is covered so they can't get in the main tank, but the filter cover has a hole on the top for you to lift the cover and apparently they've been laying little back worms into my filter. There aren't many, and most are dead, but I want to know what they are. Would they be a problem if they get in the tank and the fish eat them?

Here's an approximate drawing of what they look like in the adult form and are about 4mm in size. Overall I think it looks a little moth-like, short legs, grey, large triangular but rounded wings and a small body. I think it's some kind of fly and not a moth though.

[BikBok]

google caddis fly images and see if that's what they are.

[Ice222]

Not quite. Shorter body and wings. And not 'dusty' looking. keeping an eye out for for a fly so I can look at it more closely.

[Heir]

Sandflies?

http://www.landcareresearch.co.nz/resea ... ?Bu_Id=212

[Ice222]

Looks kinda similar, but I have had 0 bites from these critters so I can't be sure. Too the single live larvae out of my filter, hopefully it'll turn into it's adult form at some point so that I can get a better pic of it. Oh and if it helps, the larvae seem to crawl along the bottom of the container I have it in and moves in a caterpiller-like way. Haven't seem it swim, but when I picked it up with tweezers it was moving in a bit of a 'S' shape so that may be how.