Not a lot. A twenty gallon aquarium is too small for a 5" fish to begin with.
I am assuming here you mean a Green Terror Cichlid, in which case the answer is no. It would be okay for awhile if the terror is a baby, but in my experience he/she will outgrow it quite quickly. I would say the minimum tank size is 50 gallons, as these cichlids get quite large. They are also quite aggressive. My terror killed his mate and 2 Oscars within 2 weeks. Hope this helps!
Im not sure about the green terror but with the Oscar and maybe jack dempsey as long as your fish isn't full grown (10-14 inches) then it will probably be fine
Clean filter
you could put about 30,assuming they are all compatible
I would think so.
either a 15 gallon tank or a 20 gallon tank
It has a 42 Gallon tank. It has a 42 Gallon tank.
A 2002 Sedona has a 16 gallon (13 UK gallon) tank A 2007 Sedona has a 21.1 gallon (17 UK gallon) tank
yes, but be sure to remove the gasoline.
you can put a betta in a 5 gallon tank
Either a 13 gallon or a 20 gallon tank.
Shortbed trucks where equipped with a 25 gallon tank. Longbeds had either the 25 or the 34 gallon tank. Measure the tank or tank shield to determine which. 25 gallon is 46"x12"x13.5" 34 gallon is 59"x14"x13.5"