Because the FHSS systems are using much (or all) of the band, there are situations where they can be badly affected while a DSSS system is not affected at all. This can occur if the band is heavily congested except for a small portion and the DSSS system chooses that portion on which to operate.
Spotted seatrout (specks) in Louisiana seldom survive past age 5, tunas are old at age 12, and redfish may live about 40 years at the maximum. The oldest red snapper reported in the scientific literature is an individual sampled in February 1991.
Goldfish have natural life span of over 20~30 years, if your goal is only a few months, it's like getting a puppy and expect it to live a few months and you will be fine with that. No fish should be in a fishbowl. Those bowls aren't for fish keeping, it's nothing more than marketing. Fishbowls are in fact fish killers.