04-08-2014, 11:50 AM
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Old Rule Of Thumb--One angel per 10 gallons.
--18" tank height minimum
Angelfish are not particularly fast moving fish, or imo, they don't need a lot of horizontal swimming space unless they are spawning and guarding their free-swimmers!!! I have seen too many times, at the LFS, angelfish whose fins (particularly dorsal and pelvic) have been stunted or where they have flopped because they were raised in aquaria that was just too shallow and/or crammed in.
When selecting your angel, pls just keep in mind the vertical height of his/her fins, as mentioned above, different strains will require appropriate space. If he/she will be sharing the tank with other fish, as per my advice, try to keep the tankmate very peaceful (not nippy), not too zippy as to stress your angel, middle strata (preferably bottom)
That's just my advice after keeping many angels for 7 years in many tanks. Good luck with your angelfish, they are wonderful to keep, a beautiful fish, I am sure you will not regret it.