I wasn't actualy talking about over-stocking (though it is somewhat). I said it's crowded. Gouramies like honeys preffer to spend their time in the uppermost layers of the tank. This means that, in a small volume (even if it is UK gallons), you'll get aggression and territoriality issues if you have more than one male and certainly if you have other top-dwelling fish like panchax. Introducing new gouramies to an established gourami group is also bound to result in trouble as the newcomers are viewed as 'intruders'. This kind of aggression generaly settles down after a while but territoriality issues arising from lack of space can be long-term problems and need to be addressed. At the very least, if you have mroe than one male, re-home them, keeping only a single male and some females. Also add some extra floating plants or other hiding places - near the top - to increase the number of territories and make conflicts less likely to occur.