According to the aquarium specialists I bought them from, it's fine. And it has been. All the fish in the tank are active and healthy and brilliantly colored, they don't act or look over crowded, and the filter and plants are keeping up with the bioload along with the water changes. You can keep repeating yourself if you want, but it won't change the fact that they're thriving and have been for some time. And in fact I've known others to successfully keep neons and a betta this same way without incident for long periods of time.