I have been thinking about atomic dif. and may just try one out if I can hide it behind the plants. They are not the nicest looking things and I'm one of those people.
I did clean it about two months ago. Hope I did it right.
As for ADA: I know there are a lot of glass def out there(I am looking at ones made in England for around $40) and ADA is just silly with their $135+ tag. But maybe they are just that good and their ceramic has magic in it.
My mini def was good in the beginning but now I have 20x the plants that are eating up all the co2 and my bba is a run away train.