Good info. I havnt bought them yet. I wasnt gonna throw a pair in a 10 maybe one. I dont think they'd (a pair) be fine in my 55g with the current stock. Someday soon. What do you think about one in either of my 10's? I dont think it would work.
a pair might be able to go into your 55 since they are not that demanding and wont bother anyone else.. and not sure about your 10s, dont know how birchir's are and your other 10 is/will be overstocked.