Right lets think about this:
Tank is approx 250 litres
Live rock - 75 lbs = 34 k you need at least 27K so thats fine
4 x t5 only four months - so will need changing in two months (if he is telling the truth!)
Heater
405 filter - wonder why he has that?
2 hydor power heads - what flow are they?
sump fine (but when you move it you will have to reseal)
What fish?
What crabs?
What live plants?
Sand, you dont want this
RO unit, what sort, how old, membranes, have they been kept wet, how old?
Fiter pads?
What supplies?
What corals?
Just a few things above to think about and ask - you need to be careful when things seem to be too good to be true, they often are just that, too good to be true!!!
Seffie x