07-26-2008, 06:14 PM
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Male Gourami's can be a real pain. Experiences such as yours are not uncommon. As they age they become more territorial, and the move to the new aquarium was all it took for him to "claim" a new territory, which is often the entire aquarium.
I usually only suggest keeping female Gourami's in a community aquarium, unless you are keeping a dwarf species. Almost all of the 3-spot Gourami's, which includes the Blue, Opaline, Pearlscale, Gold, and Platinum, can cause serious problems when keeping Males of the species.