Does anybody have experience of keeping giant gouramis - I want a fish that will live happily in my tropically heated pond (10'6" x 12' x 4'6" deep) I currently have a 3' albino channel catfish and a 4' redtail catfish. I am worried that a large gourami might be aggressive and it needs to be a large one as the redtail's mouth is about 9" across.