It's a nice looking aquarium and a good starting point, but I would recommend lots more plants for the newts, especially stuff that will grow along the surface, Chinese firebellies will spend most of their time hanging out in them if given the choice. Dense plants at the surface will also help diffuse the current from the filter, H. orientalis do best and are happiest in still water.
If you must keep fish with the newts whiteclouds are a good choice, but you should remove the Otocinclus. Their dorsal and pectoral fin spines are a real choking hazard if the newts decide to try and swallow it. Also, Otos are tropical fish that require water temps of 22c and above, the newts are cold water creatures that can't tolerate those temps for anything more than a few days without becoming stressed and unhappy.
I realise that's probably not what you wanted to hear, but it's all easy stuff to change, so with those few improvements you can give the newts perfect conditions which I'm sure they'd thank you for.
It's hard to try and sex them from the video, if you could get some still pics of each newt from the side and below it would make it a lot easier.
