the Breeder, don't ya remember from back in your begaining aquarium days reading the more surface area a tank has the better off you are...
I have a 55 and a 40B, the 55 sucks... Go with a 75/90 or a 60, which is based off of the 30/40B. The issue with the 55 is that it is only 13" deep, if you have any animal over 5" it looks like its cramped. 55s are good for small tetras, nothing large. I had a friend with a 55 and 2 oscars, each over 8", and they grew arched backs because the skinny tank.
Get the 55, your oscars back is not going to arch, i promise

SCREW iT BRO.
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GO BiG. GET BAD.
GO MONSTER FiSH kEEPER.
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SCORE A 75 GALLON ACRYLiC.
a FLUVAL CANISTER.
drift wood.
anubias plants.
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and ENJOY THE RiDE.
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