Those are moving bed filters, the eleminate ALL Ammonia and Nitrite from the water, they are the newest 'cool' thing to have in your tank, lol.
You cant buy them as internals yet, as it what is used in sewage works and has been altered and manifactured for use in KOI ponds. If you look at my other videos there is a DIY video on how to make yourself one.
they are very good, at least as far as I have found out, been running mine for a few weeks.
not yet, as I only got him in the tank about 3hrs ago (at 9pm GMT) and the lights are off out there now. I will get some more videos of each tank tomorrow maybe, and will include the Nanochromis transvestitus and the empty nano planted tank.
and JFYI I havent got any CO2 pumps in any of the planted tanks and they are all doing great.
I'm not too sure if I'm going to try make one though as at the moment I only have my 125L planted community tank set up which I'm going to be trying to finish to a high standard. Although the filter looks great to me, little white bits of K1 media flying about looks rather messy to others.