p.s. if you don't already know, your stocking is not the best ever and you should review it.
Pray tell me why ?
210 Litre :
* 4 neons - schooling, should be kept in groups of 6+
* 2 angels - ok, although I prefer to have a 6*2*2 for a group of 6+ because in my experience they do much better in groups and in a 6ft, the rest should be able to get well away from a breeding pair
* 7 peppered corys - ok
* 3 clown loach - schooling, so should be kept in groups of 6+ and get large enough to need at least a 6*2*2 ft tank
* 2 bala shark - schooling, so should be kept in groups of 6+ and get large enough to need at least a 6*2*2 ft tank
* 13 platies - ok
* 6 zebra tetra - ..zebra danio? Or what is the scientific name? Should be ok
* 4 harlequins - schooling, keep in groups of 6+
* 20 cherry shrimp - aka loach snacks
* 1 male Betta - most males will stress themselves to death in a tank that size, but I have seen it work on a few occasions in planted tanks
70 Litre : ok
66 Litre :
* 1 female Betta - ok
* 2 angels - must have at least 18 inch tall by 3ft long tank to grow, see above for more
My harlequins, zebrea and tetras shoal together. Very nice to watch....
...because they do not have any alternative. Real schools are much more pleasant to watch.
Bala Sharks I have had in this tank for 3 months but bought them about 6 months ago and they are very happy also.
How big are they? If you bought them at 2", they should be around 6-8" by now.
Peaceful tank
Unfortunately, it will be only until the point when one of the larger fish turns around and starts chomping on its tank mates.. this will happen and without any warnings. Also the larger fish will have health problems and short lifespan related to stunting.