Can anyone give me there opinions on housing my jd and gt together in a 4foot tank, jd is in the tank already with 2pretty small silversharks and doesn't bother with them and seems pretty placid, gt is a bit of a bugger and has started to pick on my severum, jd is atleast a couple of inches bigger. Look forward to hearing your views..

Not a combo I've ever tried myself, so couldn't say, if it was me however, I would chance it, and keep and eye on them.

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I have done it many times in a 5foot tank with no uniform result, its a hit and miss, both fish can be aggressive and territorial.

JD's have a reputation for being very agressive. It is well known as being one of the most aggressive American Cichlids hence being named after the Heavyweight Boxer, Jack Dempsey. I have know some to be very placid but then others are very aggressive so if you were to give it a try, then be careful and any signs of aggression, remove the GT.

GT's themselves can be aggressive too but nothing like a large male JD.

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8' x 2' x 2' - Piece of Ocean.
6' x 2' x 18" - Wild Caught Zaire 'Moba' Frontosa
4' x 2' x 20" - Malawi
4' x 22" x 18" - Malawi + Victoria
4' x 18" x 18" - Breeding Cuban Cichlids.
Trigon 190 - Male Paratilapia Polleni
20" x 20" x 20" - Marine
30" x 1' x 1' - Hospital Tank
2' x 1' x 1' - Tropical

and

7x - 1' and 2' cichlid fry tanks

some might say that the JD is a very aggressive fish but if you look up and have owned other not so common Central America Cichlids you will find out that the good old JD is a light weight as far as big bad Cichlids go.

If I had a fully grown male aggro JD I would not fancy his chances with these guys.

Amphilophus citrinellus
Amphilophus labiatus
Parachromis managuensis
Cichlasoma trimaculatum
Cichlasoma uropthalmus
Nandopsis haitiensis
Nandopsis tetracanthus
Parachromis motaguensis
Parachromis dovii
Vieja bifasciatus
Vieja maculicauda

and I would say that the P. Dovii or the common mix of labiatus/citrinellus would be on top for the most aggressive CA Cichlid.

Would have to agree, I had a 6" JD that took a beating from a 5" female brown acara, fish was never the same after that and a young 4" pair that were destroyed by 2" salvini females. They can be aggressive, but in the grand scheme of things, maybe not so deserving of their name.

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what were u keeping ure JD's with??? guppy's?? JD's are placid as far as it goes with big bad centrals as bolty said.

id eat my shorts the day i seen a JD beating on centrals the way ure saying, IMO con's could take on JD's

JD's are aggressive but nothing liek your saying seriously man get ureself a parachromis and put him in with ure jd then we'll see who's kicking who.