what to add?

fish..fun?wow said:
they've been in the tank now for close to 6 months
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It's not a long time. You need to get another tank preferably a 55g for these dragon gobies. Either that or return them to the stores or give them to someone else who can keep in them in a brackish water tank. Your fish will never be able to thrive for a long time. Look on lifespan for a year or two instead of longer than that.

Your white corydoras is most likely an albino Corydoras aeneus. Get 4 more cories provided you ditch the dragon gobies first.

Keep only one species of gouramis. Your paradise gouramis are too aggressive to ensure the rest of your gouramis won't be bullied. Gold gouramis also have the tendency to bully smaller tankmates or even those of similar size. Stick with the dwarf gourami but bear in mind you cannot have more than one. Males tend to rival each other for boundaries and your tank doesn't have sufficient space to permit that.
 
It sounds to me like that tank is already at max capacity for fish. Dragon gobys get quite large, and are brackish water fish. 6 months is nothing for fish that should live 7 - 10 yrs. Most fish are not going to fully mature in 6 months, nor will they reach their adult size and aggression levels.
Dragon gobys at full grown will eat corys, and anything else they can fit into their mouths. They are a predator.
If you really must have more fish, the right thing to do would be to move those gobys to a proper environment, which would make room for something else.
Also, those gouramis are a bad mix. As they mature you're likely going to have problems, and will probably be left with a single gourami in your tank. Paradise fish are aggressive, that is their nature. Should you find you have a mated pair, even more so.
Your tank sounds like it's a bit of a mess right now, and I would suggest taking care of that instead of making things worse. Not all fish are compatible. Not all fish have the same needs or aggression levels. It's a good idea to research a chosen species before bringing it home. It's very hard to care for something if you don't know anything about it.
 
dragon golbies are huge, 1 is full grown, when it was bought it was at about 8 or 9 inches and was in fresh water, now 1 is about 12 or 13 inches and seem to be thriving in freshwater. from what i understand fish can be conditioned into freshwater...also, no they will not eat coreys, its a commom mistake but their really not predators in the sense of hunting down small fish. they roam the bottom and put gravel/rocks into their mouths and filter out food particles. I also drop in pieces of krill that sink and they scrape the bottom eating them.
 
fish..fun?wow said:
dragon golbies are huge, 1 is full grown, when it was bought it was at about 8 or 9 inches and was in fresh water, now 1 is about 12 or 13 inches and seem to be thriving in freshwater. from what i understand fish can be conditioned into freshwater...also, no they will not eat coreys, its a commom mistake but their really not predators in the sense of hunting down small fish. they roam the bottom and put gravel/rocks into their mouths and filter out food particles. I also drop in pieces of krill that sink and they scrape the bottom eating them.
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some people have done it but I have no doubt that a dragon goby would thrive in a brackish tank while it would merely survive in a pure FW environment...not to mention that ONE 12 inch fish should not be in a tank that is probably only 3 feet long! (what are the exact dimensions? is this a hex tank or rectangle?)

but the gouramis will be a problem...your tank is simply too small!!!!! there is not adequate room for all of them to establish territories! I suggest picking ONE gourami...not just one species, but ONE fish. Sorry for being so blunt but I am 99% sure you will run into problems eventually...

and you should get more corys...
 
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