Rasboras, gudgeons, and water hardness
I want to get 6-7 Lambchop (espei) Rasbora and 3 Peacock Gudgeons. This would be in a 20H tank that holds a Honey Gourami, a GBR and a few endlers. I know the number of fish wouldn't be too much, but would the Peacock Gudgeons get overly aggressive, should they decide to breed, and kill the other fish?
Also, my water is not soft. It's slightly hard, with a PH of 7.6. Hardness averages about 25ppm, according to a town 10 miles away. Would this be too hard to keep the espeis? I don't want to order them if they'll get killed by the gudgeons, or the water is too hard for them. Thanks!