It is a great magazine. and well worth a subscription, the only complaint i have is it does repeat itself a little. ie they had 3 articles on pufferfish (freshwater) 2 on singrays and 2 on peacocks, over the space of a year.
I did try tropical fish hobbiest once, and wont bother with it again, its more expensive, and dosent compare to this, the info supplied in PFK is normally quite in depth, as well as giving ideas for less usual tank setups