weird worm-like creature in aquarium

[TheShield]

Hi,

About a month ago I found one of this in aquarium while rearranging plants. Found it attached to a plant root. I chased it (it borrows really fast in gravel) and captured it with a net. It looks like a small dark red leech, about 1-1 1/2 inch long.

Today I found four of them in the sump of the same aquarium swimming agains the current. One at the bottom was moving like a true leech by using head to anchor to the glass. A close friend tolds me that it is possible to be from wild catch tubifex worms he used to feed his fish, I have many plants from his aquariums. It seems that along with tubifex collectors got these creatures. I have only SAE in this aquarium and I don't feed them anything, they rely on algae (if any) so it's impossibke that I introduced them in aqaurium. I also got different kind of snails.

Could someone please tell me what it is and if I should be concerned about it, eventually a removal procedure?

Thanks.

[Pufferpunk]

Earthworm--ever fed one to that tank?

[J-P]

Don't earth worms drown in water?

[TheShield]

No, I didn't feed them earthworms or anything else. I only have 3 fishes SAE in the aquarium and they eat algae when it's develop on plants/glass/gravel/etc

[JoseDepacos]

Looks like a leech. Can you see mouth parts on the bottom of it? Put it on the back of your hand and see what it does. Lol.

[Nick]

Some kind of worm. Feed it to a large puffer.

[Brandon8521]

Looks like a snack for your gsps.

[Dadof4]

Yeah, not a earthworm. Earthworms do not stick their head to the glass. What I would worry about is this being some sort of parasite. If you look at it, does it have a mouth on the end that sticks to the tank? If it does you should see something teethlike...