I have in mind to get either 5 denison barbs or 12 cardinal tetras
Can I get them all or one or the other

I don't quite know when there might be *too many* fish in this tank - I want them all but I'd rather the fish be happy

Any input is greatly appreciated.
p.s.
I kept some zebras about 12 yrs ago when they were relatively new to the hobby and highest price was $50 - and the news that they were dying on most fishkeepers. My 3 stayed with me for almost a yr and then sadly died off as little was known about their dietary needs (and I was a pleco fanatic then with 3 tanks and 8 plecos so it was especially heartwrenching) In a few mos I intend to get a 20g zebra breeder as I become re-educated in the hobby, so this question about tank stocking is pretty important to me.
