well from what i can see theres a
RO unit which is for filling up ya tank ,,,,
There is also a
sump (glass tank last pic) and as most sumps are
DIY then they can be fitted many different ways but general idea is same google sumps,,
i see a air stone which is not needed if you have enough movement around the tank with power heads ,,,,
2nd pic is metal halide fittings and ballasts wit what looks like some sort ov auto top up system or the return pump from the sump ,,,
1st picture black box is overflow box,,, a
test kit and a heater
what i dont see there is a
skimmer which i would advise you buy one to fit in sump
3rd pic is a bio ball tower where you would put in the right hand side of the sump and would feed from your overflow box then in to sump ,, but personally i would remove balls and put
live rock rubble in there as bio balls can be
nitrate factories and not really good ,, unless well maintained hope this helps you out a bit