It seems a lot of fish related media from about 2000 to 2005 has entered a dead zone. It was pre-digital by a hair - not old enough to be seen as archival but old enough not to be digitized. Add to that the carnage in magazine world when everything became free (ie, authors stopped being paid) and there wasn't any incentive to digitize. Aquarium Fish Magazine (owned by Vogue) and Freshwater and Marine Aquarist both went under, and TFH and English Amazonas survived by the skin of their teeth.
TFh had a circulation between 40,000 and 60,000, which wasn't bad. But it stopped dead over very little time.
I don't know if any magazines are profitable enough to pay someone to digitize back issues.
I used to teach a University morning class, then another in the evening with no time to really do anything at home in between. One of the things that made me realize I could do that writing was the biology library, which somehow had about 25 years of TFH magazines sitting in the stacks. I'd read them on my 3 hour break, and they were a wealth of information. Fantastic stuff, from 1970 to 1995.
In many ways, we have lost unbelievable amounts of information. It's fashionable to say things are outdated, but breeding reports, and hands on experience info doesn't change. Info's built on info, and we allowed our aquarium civilization to go full Atlantis - lost beneath the waves. I just read an online article that authoritatively stated 'facts' disproved 30 years ago. In probably 700 words, it had two major errors in it, disproved by serious hobbyists in the print era. It's like we're starting all over again in many ways.