Thanks for your constructive feedback, Tarquin. I'll take it into account the next time I organize something like this.
In fact the whole thing was ridiculous from the start. The way how logos were submitted was ridiculous - in any size, in any format. The way they were presented even more (basically that already was a preselection). THe way the rules were changed some time during the whole process also weren't quite what you should expect from a fair contest.
The way the final voting was done was the most ridiculous thing at all, because there were'nt just 11 candidates (as they were supposed to be left from the first round), there were about 35, because each alternative was obviously a seperate candidate. So the "type 2" logos got round the bout 2500 points in total, the "type 1" logo candidates about 1000 points. Unfortunatly, type 2 had five "alternatives", type 1 just two. That's the reason, why that silly fish bowl now is the so called "winner". Because there were less alternative to spread the votes on, not because it got more votes. From a quick check also the "type 7" logo got more votes in toto than the so called winner. If there was just one alternative for each type of logo, things would have gone really differently.
Let's keep the old logo, let's keep the candidates, and let's try again in half a year in a better organized way.
Uli