I currently have a 55 Gallon Aquarium.

I wish I would have started out larger with a 75 or a 90 as I would have 6 more inches to aquascape with.

Here are the dimesnions:

55 Gallon 48" x 12" x 21"
75 Gallon 48" x 18" x 21"
90 Gallon 48" x 18" x 24"

All are 4 foot long Tanks.

So I am debating on the 75 and the 90

75 Pros
Cheaper (Not really important)
6 more inches of Gravel Space for Aquacaping
18 inches deep instead of 24 so more Light hits the bottom of the Tank.

75 Cons
Less swimming room for Fish



90 Pros
6 more inches of Gravel Space Aquacaping
15 more Gallons of Water to make the Fish happier

90 Cons
More expensive (Not really important)
3 Inches Deeper (Less Light hits the bottom of the Tank).

I want to go with the 90 Gallon so my Fish have more room but my Biggest Concern is the fact that it is 3 inches deeper than the 75 and less light will hit the bottom of the Tank affecting my Corals (Plate, Acan Lord, Green Wellso, etc).


Is the 3 extra inches in height going to make that much of a difference in terms of Lighting?

What should I get the 75 or the 90?

Has anyone else run into this dilemma on the site?

If so which Tank did you choose and why?

How did your descision turn out?