They get pretty BIG though, and only feel secure in groups, so a large tank is recommended (500 L or more). They're the type of fish that
concerned aquarists should resist the urge of having until they can actually care for them in the long run. My 3 balas took only a year to outgrow a
100x50 cm tank, they started becoming uncomfortable, often freaking out and hurting themselves on the glass and decoration. Moved to a 150x60 cm tank,
they calmed down again and in 3 years had reached about 25 cm, with perfect bodies and huge fins (see photo).
Tohle sice není přímo o zarudlých ploutvích, ale je dobré to vědět!
http://www.aquahobby.com/gallery/e_bala.php
Kdyby byla potřeba tak to přeložím, ale dnes se mi už nechce...