Hey I think jim means sw coldwater aquariums. Which is neat for me and maybe you. Where I live in NJ you can catch your own coldwater sw fish in tidepools and in lagoons with seine nets. So far I have caugt some small coldwater wrasses, pipefish, seahorses, freckled blennies, and many "tropical drifters" which are carribean fish that travel with the gulf stream including:spotfin butterflys, 4 eye butterflys, green and planehead filefish, porky puffers, queen and french angels, queen triggers, and some others. What im sayin is that in coastal states it is easy to catch small coldwater sw fish. Remember, the first SW tanks at the turn of the 19th century were coldwater fish and inverts collected from tidepools in England. Hope this helps!