What fish I can keep in my tank?

[Gourami Swami]

I agree it looks female due to thick blue beard- hadn't really looked until AK posted it

 

[duanes]

Sailfin mollies would be the most natural choice, although in a 75 gal tank, there isn't much space to escape. In nature when JDs attempt to eat the live bearers, they usually miss 8 or 9 times out of 10 or more strikes. In such a small tank, that ratio of attempts to catches will be greatly reduced. If you get large enough mollies, it will most likely be the fry that are eaten.
In my tanks to continue the numbers in a shoal of live bearers, I usually remove pregnant females to another tank so some of the live bearer fry survive.
Here is a video of how JDs live in nature.
Eden2
and below a few still shots of JDs attempting to catch a live bearer

 

[SJ Rex]

I agree it looks female due to thick blue beard- hadn't really looked until AK posted it

Well, guess it's a good thing I never bought "him" a lady lol

 

[SJ Rex]

Thanks to everyone who has posted here! It has been very helpful and I'm excited for the upcoming changes to be made!

 

[Predator07]

Your tank is already overstocked in my opinion. Your jaguar will continue to grow, big males have been known to reach 15+". And the aggression from the jaguar, is very normal, this fish instinctively will not allow other competitors (cichlids) in it's territory, which would be much larger than a 75 gallon tank.
The jaguar most likely killed the firemouth, and now is turning on the only other competitor, in sight, the jack Dempsey. The JD may meet the same fate if left with the Jag in there for too long. My advice would be to re-home the jack and enjoy the jaguar as a wet pet. A 75 is considered quite small for a male jaguar, may as well let him have the whole tank, if you don't plan on upgrading. Just my .02

Are jag missed understood when it comes to it's aggression? I've see a lot of jaguar with other tank mates without any issues ... is it because of size on the tank

 

[Predator07]

Welcome.

Your jack is on death row anyway along with everything else. Honestly your lucky to make it this far. Introducing an Oscar to an established territory would be very bad.

A male jag will make that 75g look very small and will not be able to move real good in a few yrs. Keeping water quality top notch will become hopeless. Been there done that with a 14" jag.

Your jag is very nice but still pretty small. If you really want to keep it (I would) then remove all other fish and give it the 75. Save up and buy a used 125-150 you have a few yrs probably. Be prepared my biggest male was over 17" my smallest was right under 16" with a lot of bulk.

I have some juvenile cichlids in 150gallon grow out tank and was planning on adding 3inch jaguar for now.. Any advice ??