5 kuhli loaches with only a sponge filter
I'm coming from ponds, so while I know a lot about fish, my knowledge on tropical fish is smaller.
My question would be, Would it be possible to hold 5 kuhli loaches in a 12 gallon planted aquarium with only a large sponge filter, or would that not be enough filtration? Assuming I do gravel vac/cleaning once a week.
Thanks for the help