Sorry, but statements like that simply confuse people that have the same or less experience than you do. When one is offering up advice one should keep that in mind that the exception to the rule isn't what we should consider, but more what will TYPICALLY take place in a closed system such as an aquarium. Generally speaking, J. dickfeldi's are aggressive, not "gentle" such as you stated. You wouldn't know that because your experience is very short term, with a single, semi-juvenile fish, most likely a female. Consider it part of the overall learning curve of this hobby. And you're welcome.