Haha nah not quite allergic, but i have read that they are kinda picky?
That depends on the species, same as with tetras, etc. Basically, if you take care and don't do anything stupid, you'd probably be fine with most species. Problems arise when people don't look after these fish correctly, same as they would with Corys and tetras.
Just a question....how wouldn't the gourami be good with tetra's, are they agressive or nippy?
That very much depends on the species. I list some suitable ones here: http

/aquariumadventure.wordpress.com/2011/07/28/picking-species%E2%80%A6/ and I decided to go for
Pseudosphromenus dayi (http

/aquariumadventure.wordpress.com/2011/09/04/pseudosphromenus-dayi/ ) for a similar tank. Personally, I would avoid dwarf gouramis as having too much potential for an attitude, although in my personal experience, they were fine.
Whats your favourite bigger fish that would fit it with 8-10 julii corry's and 10 neon tetra's ?
You're talking about an SA biotope-like tank here, so I'd definitely pick an SA dwarf cichlid, as I wouldn't even think of looking at any other one, and go for a proper blackwater biotope. Because of the dimensions of your tank, I would chose a pair cichlid instead of a harem one and take only a pair. I think I would probably chose a pair of
Apistogramma borellii because the blue and yellow colours will contrast nicely with the red bellies of the neons.
I don't have any "always favourite" fish, I have different favourites for every setup
