yeah, a pleco would be great for doing that but u need to feed him sinking algae pellets which have added nutrients twice a week
don't use goldfish or koi! they will eat algae but it's not right to starve them and make them eat it!
how would u like to be starved and forced to eat dog food ...
are u sure they aren't minnows?
they might be neon tetras!
em... it's hard to tell
but i would say they are neon tetras (bright blue and red, small 1-2 inches,) or maybe a pleco or some type of catfish
or loach!
sorry it's hard to tell
could u give any more information, did they look like...
okay i really need to section off my tank , i want my guppies and my betta in the same tank but in different areas
is there anything i can buy to section it off