First of all a new bristlenose pleco (that was hiding behind the stick-on thermometer):
It's about 3-1/4" long from tip to tail. Can anyone tell if this is a male or female? I thought for the size of the fish and the size of the bristles it might be a female.
Then we got this:
He's not real pretty (like the bright yellow ones) but he's quick.
When I got him home there was a LOT of little black junk in the bag. Are they that messy or is it possibly stuff from the tank or what? I just plucked him out of the bag and into the tank after acclimating him of course. Also should I have more than one? Will he/she be lonely?

It's about 3-1/4" long from tip to tail. Can anyone tell if this is a male or female? I thought for the size of the fish and the size of the bristles it might be a female.
Then we got this:

He's not real pretty (like the bright yellow ones) but he's quick.