There are only 6-7 issues of English Aquajournal (vols. 33-38 i think), which stopped publication for some years already (maybe people then didn't think it was worth paying for....), but you can get them from some LFS like NA Nature....
the ongoing series is the Japanese edition, which features newer Amanoscapes, technical report, hobbyist tanks (mostly Jap) and field trips.... don't think it's possible to say which issue is must-have... they each have a different theme.
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