Hi Fishnoodle and welcome to Tropical Fish Keeping forum.
Well, other members have said it, and I needn't beat it to death as you seem prepared to accept the suggestions concerning your stocking. I can't enlarge the avatar photo to see it clearly...are you sure it is a 22 liter tank? Presumably the fish are quite small.
Your two and three times weekly water changes plus the thick plant growth is what is saving the fish. Though this should not be allowed to continue as damage is being done that is not visible and at some point, as I think one member mentioned, this will almost certainly snap.
We have fish profiles, second tab from the left in the blue bar across the top of the page. If a common or scientific name is used in a post identical to that in the profile it will shade and you can click that for the species' profile, example Neon Tetra or Paracheirodon innesi. In each profile there is data on numbers of the species, minimum tank size, compatibility, etc. This data is reliable; I wrote most of the profiles and I have several sources from biologists and ichthyologists for the data.
To try and put what's happening in your present tank in perspective, have a read of this article on stress: http://www.tropicalfishkeeping.com/f...um-fish-98852/
And never hesitate to post questions, many members here have considerable experience and are willing to help.