Longfinned Batfish

Which species are you reffering to? The Teira Batfish (Platax teira) or Pinnate Batfish (Platax pinnatus)? There is a HUGE difference in the two. The Teira is commonly referred to as the Longfin but the Pinnatus can too. Anyway, not sure what size tank you have (too early in the am to do the conversions) but they get to 19 inches long (all bat sp) and will require at least a 200g tank when adult. Teira Bats are easy to feed, readily accepting just about everything. You can start it with live brine and then convert to higher quality frozen foods. The Pinnatus is a HARD to feed and if it does start eating generally dies from fin deterioration due to improper handling while shipping. I have kept all 3 sp (my pinnatus ate but died within a month when the fins started deteriorating-had tears in the fins when it came-and once they get any kind of deterioration they are done). The Teira is my favorite of the bats.
Also just a side note, by you purchasing the Bat, the store sees it as profit so will order another and then someone with a smaller tank will buy it. Sometimes is better to leave the fish at the store to discourage the store from ordering another. Anyway hope this helps and good luck!

Your photo is no longer available... and, your Pinnatus will also likely be gone soon. Sorry for the hard news but they have an almost 100 percent mortality rate in the industry and should not be collected or sold. Better to pass them by and let the LFS take the hit on them; buying delicate species like Platax pinnatus only encourages more orders and continued exploitation.