Yeah you are pretty close to a full stock. Tank is roughly about 20 gallons? I had 4 sword tails, and a platy in a 10 gallon, and they have since been upgraded to a 40gallon tank and because they have more room to go, they don't seem to be as aggressive towards each other. Keep an eye on the tiger barb as I have seen them be really aggressive. Although, my sword tails punked him out pretty good. I would be more worried about the tiger showing aggression towards the smaller fish you have. Just something to watch out for. If you see the tiger going after the smaller fish, you may need to move him out. This is the tank my sword tails are in. http/www.fishforums.net/index.php?/topic/367053-my-current-tank-and-my-tank-in-cycle/page__p__3064196__fromsearch__1#entry3064196I have 4 dwarf gouramis, 4 serpae tetras, 4 black neons, 4 swordtails, 4 tiger barbs and 1 neon tetra.
They are all relatively small. I don't know their exact sizes but none of them are larger than 3 inches.
Tank is 60cmx30cm. I have a pic of it here
Your tank is very lovely by the way. We are looking into similar styles for our next tank (we already have 4 and looking forward to our next! lol