N0body Of The Goat
Oddball and African riverine fish keeper
1456/20=70l
60x45x50=135l
... Just a slight difference in volume, n'est-ce pas?
Right, so you have a squat tank with very similar dimensions to my Aqua One 620T (which is 140l). These sort of tanks need a far lower stocking than their volume suggests, because they have a relatively small surface area for their volume, 3000cm[sup]2 [/sup]versus 3600cm[sup]2[/sup] for my 120x30x38cm.
So going back to your list, besides the original fish I had concerns about, I now add Dwarf Neon Rainbowfish (need more room) and your choice of Corydoras will be limited too (many get too big for a 60cm tank and others might struggle with breathing air at the water surface in a 50cm tank). The tank is too squat for Dwarf Chain Loaches and most "hillstream loach" too, btw.
How about 8 False Penguin Tetra or X-Ray Tetra with a pair of placid cichlids (Laetacra, Keyholes, Cockatoo Apistogramma etc.), or alternatively just 12-15 Corydoras hastatus (that will use the whole tank depth)?
