Bugs in aquarium?

So i visited my local aquarium recently and looked at the one of the exhibits they had which was a surinam toad exhibit and with a closer look at the substrate i noticed these little bugs scurrying around the substrate, they kinda look like freshwater scuds but im not sure if they are, and i really curious what they are and was wondering if they have any maintenance jobs eating excess food, keep the water cleaner and if they do does anyone know how i can get them in my aquarium?

ill attach a pic of the exhibit and a close up of one of the bugs i think caught on camera but its not clear, they were dark brown and a grayish black, im thinking their scuds but maybe some people here have them or know what they are.
here is the exhibit and the frog!



and a close up from the picture above


thanks!!

lol forgot to point it out, but the bug thing is on the green leaf to the right the little brown thing, or i think that's the bug

bump

joe jaskot said:

Hard to tell what it is from the picture. If it is a grammarus, they do eat dead plant material and algae. Problem with them in aquariums is that most larger fish eat them.

Click to expand...

Oh I see, would it be possible to be able to create hiding places in an aquarium and have like a breeding colony of them to produce food for my other fish?


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