yes I have had a biorb, I used it for about 2 months, before swapping it for a 30 litre with a friend, my tank met her needs more than her own and vice versa
I liked it, very good, biorb state it can hold more fish per litre than any other because of such effective drainage, I didnt test this, I only had my betta and the mollies in it.........oh and two teeny weeny tetras
I am getting it back in a few months once my friend moves to wales and can get her tank back, at which point I will need lots of advice to equip a great 30 litre tank of my own
surprisingly though the bubble tube causes very little water movement while oxygenating the tank, perfect for bettas I now hear
, but didnt know this at the time
edit: no matter how often I check those spellings cock up in the posted version