I'm a bit confused here, so let me clear a couple of things up. Firstly, orange chromides (
Etroplus maculatus) are normally kept in slightly brackish water. While they naturally occur in both fresh and brackish water habitats, most aquarists find they don't do well in freshwater over the long term. I'd also want you to check out what this "dragon fish" might be. Is it
Gobioides broussonnetii by any chance? That is very definitely a brackish water fish, and never lives long in plain freshwater.
Both these species could be kept successfully at SG 1.005 (about 9 grammes marine salt mix per litre of water).
Gobioides broussonnetii is a difficult fish to keep, and many people fail to keep it alive for any length of time. To recap, bear in mind it needs a sand -- never gravel -- substrate that allows it to sift out the sort of foods it eats, primarily wet-frozen bloodworms, brine shrimps and other small invertebrates. Augment its diet with algae wafers and live brine shrimp. Given it can get very large, up to 50 cm long, make sure the tank is big enough, upwards of 200 litres.
Obviously, brackish water fish can't be kept with freshwater fish like bars or suckermouth catfish, so you may have to separate out these species into their own aquaria. It is absolutely crucial you review the needs of fish prior to buying them.
Cheers, Neale
I have 2 orange chromides, two cherry barbs, a "dragon fish" and a bottom mouth catfish, and the chromides are breeding. Im not sure what to do to ensure that everything will run smoothley. I have only had the an aquarium for a few short weeks and still new to the hobby. Any info. will help. thank you