Hello kezbabe and welcome to fishkeeping
Now where do I start, well I guess the first question I should ask is although you you left the tank empty for 2 months did you actually cycle it before adding the fish because it has to go through a cycle to make it safe for the fish, other wise they will be swimming around in a toxic solution, see attached link
http://www.thetropicaltank.co.uk/bcycling.htm and do you test your biorbs water at all including your tap water, also do you use a water conditioner to remove the chlorine and chlorimine etc, I know you said you brita filtered it but that may not be so good as it may be too pure, although not sure on that, When you clean the biorb do you clean the ceramic media fully or use a gravel cleaner as cleaning it fully will kill of the good bactera and course the biorb to recycle, it could be a number of reasons the fish died but if you follow meerkats example see thread
http://www.fishkeeping.co.uk/modules/ ... opic_id=61&forum=1&jump=1 then there is no reason why you can not keep a couple of small fancy goldfish happily for at least 6 months untill they out grow the biorb or you could try white cloud mountain minnows and the likes, any problems or worries just ask and we will do our best to help you. Good luck
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Wrote by kezbabe
I'm going to get the water tested at pets at home cos they have a free tester thing tomorrow, hopefully that will throw something up.
Let us know how you get on