Is that supposed to be a photo
of the tank "on it's side?" If so, it's not...the inlet and vent are at the top where they belong, and the discharge is where it has to be unless it it's ON the top with pickup tube inside the tank that goes to the bottom.
However, as others have said...it's best to put all the fittings ON the top of the tank...but that requires at least 5" clearance above the tank. So I suggest that you return that tank and start over with one that's the right size/shape and has the fittings in the right locations to prevent most problems.
Ronco Plastics Ronco Plastics
makes TOP quality tanks for a VERY reasonable price
(maybe even less than you paid for this tank) and has more than 400 shapes/sizes, more than 100 of which are non-rectangular. And they install fittings in the sizes and locations specified by the customer when they make the tank.
With that many to choose from, you'll prob'ly find one that'll hold more and fit in a better location too. If you'd like some help with that, send me an email
I have no connection with Ronco Plastics, btw...I was a Ronco distributor once upon a time, but sold my company over a decade ago, so I know their quality...which is outstanding.