and here is a few of the various holes in the tank
this is the vortech box, allowing the flow to be passed from top corner at the rear of the tank, down to the bottom front opposite corner, allowing the vortech box to be sat inside a dry chamber
also shown here, in the rear right of the tank and in the next photo, next to the weir box
the weir box also shows the 2 x 63mm overflows and the 40mm feed back to the tank, this is replicated on the back of the tank on both sides
the next pic shows the closed loop feed chamber, this contains 2 x 50mm bulkheads, these will have strainers on them and will feed 1 x ITT ag series pump on each side of the tank
which in turn will feed an oceans motions 4 way, each side of the tank
and in the next picture, you can see the front and mid sand seperators, these allow the sand to be laid in the centre of the tank keeping bare bottom behind the rockwork aswell as a bare front three inghes running the full length of the tank
this will prevent sand from being picked up when cleaning the tank and scratching the acrylic
hope this will help identify some of the tank layout
regards
rupert