I see three real problems 2 of which can be overcome with attention and knowledge.
The first has already been mentioned about the pictures on the boxes of totally inappropriat inhabitants for the smaller tanks. If the manufacturers would be more responsible about what can actually be kept in these tanks it would greatly improve the success of nanos.
The second has also been mentioned repeatedly. There is nothing than can replace research. If you have done your research before you buy then you are startiing way ahead of the game.
The most difficult thing about a nano though is the constant attention needed to the paramaters. It is just so easy for a small problem to become a big problem with the reduced water volume.
After saying that I have seen some incredibly beautiful nanos. Some by newbies and some by people who have been around.
Generally what I tell newbies with nanos is that they are more difficult and require more maintenance but it can certainly be done and done very well.
Even I have a nano so how can I be against them.
