Free! 1-4 Freshwater Angelfish

[ScottyB]

What size tank do these things need?

general minimum rule is about a gallon per inch (lenghwise) of fish if it's freshwater, 5 gallons per inch for saltwater. i have a 10 gallon display for my 1 two inch long saltwater fish and it's just enough for it to have ample room because it's so active.

this is a tricky rule though becaus you need to compensate for more predatory or territorial fish, or for thick (tall) fish like angels. i'd say 40 gallons or more is a good size due to them being so large overall and territorial/predatory.