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I have several tanks myself, all saltwater.
60g sps dominated reef
55g seahorse with soft corals, sponges, and seahorse-friendly fish
25g lps dominated reef with a frogfish
6g scorpion leaffish tank
I've tried to pet them, but they dart away...little buggers!
Anyway...I wanted an aquarium years back..the Mrs. had one when she was growing up, and said it was a PiTA to take care of, and that I'd kill everything within a month depressed Then we got cats, and figured it wasn't a good idea!
The tanks separate or share a sump?
What seahorse friendly fish - gobies? mandarin?
I have real pets... ie. not fish
I have been keeping saltwater/reef tanks for over 10 years, currently I just have just one little 20 gallon mixed reef with a clownfish and a goby and various invertebrates. Keeping marine fish, and especially corals,is a very technical hobby that requires a lot of research, financial investment in good equipment and a significant commitment of time for maintenance. But is also very relaxing and rewarding.
One thing that should be mentioned, especially on a scuba forum, is that this is a hobby that is potentially damaging to the marine/reef environment. Some collectors use very unsustainable collection practices (such as the use of cyanide and dynamite, over harvesting, etc.) because frequently the collection is done in very economically depressed areas where conservation takes a backseat to feeding the family. Most distributors have conceded to pressures of the market and only source animals where sustainable collection methods are practiced.
Even better, nowadays, there is more and more aquacultured/maricultured options, where hobbyist are trading tank raised/breed animals and there is even a few commercial endeavors that are doing this on a large scale. Not only is this practice more sustainable for the oceans reefs, but most of the time, captive raised/breed animals are much more successful in the home aquarium. At this time, the industry is still pretty limited, and while corals are available in an amazing array of colors and species, fish species are more limited because of technical hurdles that still need to be overcome.
If you already have a tank or are thinking of one, I would strongly encourage you to at least consider aquaculture and/or maricultured animals as often as you can or even try to go to a 100% farmed inhabitants.
Happy Reefing!