With the Badis, multiple males is iffy, unless it's a sizeable tank, and there's plenty of territory for each male. Because of that, then in a 10gal, a pair or a small harem, but remember that the females aren't as colourful as the male.
With the gobies, pairs is ok, I had 2 pairs in my 34l, before I shifted them to the bigger tank. They like to breed in caves, I used some pvc pipe cut up into short lengths. Never quite had the setup quite right for them to breed, but beautiful fish nonetheless.
With the gobies, pairs is ok, I had 2 pairs in my 34l, before I shifted them to the bigger tank. They like to breed in caves, I used some pvc pipe cut up into short lengths. Never quite had the setup quite right for them to breed, but beautiful fish nonetheless.