Still don't have knowledge, time and money for saltwater. So im waiting for fresh water types..thanks for you'r suggestions.If you are looking for a more difficult fish to keep alive, apistogramma dwarf SA cichlids can be quite fragile in my experience and require low pH. Discus are also notoriously fragile.
Saltwater in general is more work and lots more room for error. If you want a real challenge I would try SW.
Thank you very much. I'll add discus and datanoids for my list.8 years ago i kept discus and i failed. bcoz of my lack of knowledge..I would say discus are hard to keep, datnoids are for more experienced keeper to try and keep them stable but saltwater is really the challange and is for experienced fish keepers
String rays and african tiger fish..yes both are my favorites. specially vittatus...How about freshwater stingrays (hystrix) orAfrican tiger fish. Both can be challenging to keep and can die a lot