the last sev pics it's def Ficus maclellandii, common names Narrow-leaf Fig/Banana Leaf Ficus/willow leaf ficus. 'Alii' and 'Amstel King' are dif cultivars. i think it's alii too. you substrate looks similar to lechuza stuff - it's a special clay aggregate for sub-irrigation. it's german and is widely used in europe. go to their site - and you can read about how it's done. they sell special planters, but the aggregate can be used just by itself too in self-watering system by itself or with soil on top.

mushibu10 - Ken refers to potting 'media' (probably ought to be potting 'medium' if you want to nit pick about singular and plural) but over here we call it potting 'compost'. Seedling compost isn't really the thing for long term growing as it doesn't have sufficient nutrition and is quite dense. I just use the stuff sold as house plant compost. Any garden centre or DIY place such as Homebase will have it. No need to repot now but when you do I'd get the appropriate compost. Note to US readers. Don't panic over me recommending 'compost'. In the UK the word means both rotted down stuff and growing media. It's quite clear which is which in the shops.

It needs to be repotted! As far as I know is that it can take a lot of your sun, needs good drainage and a fair amount of watering and likes humidity.

should be lots of info in the houseplant forum ... my usual recommendation for plants that are basically .. outgrowing the house ... is to learn how to propagate them ... and once you get one going ... you get rid of the big one ... most likely ... its too big for the pot.. and the media is worn out ... but as you suspect.. if you go in there and put in loose fresh media .... its going to be real hard to keep it upright ... and a stake is not going to fit well with the decor of the room ... i am even thinking... i have run across youtubes for propagation ... on this very common houseplant .. finally.. dont get caught up ... in trying to make it look ... like it used to ... its a living plant ... ken ps: you can probably also cut it off at about 4 inches .... repot it.. and it will rejuvenate ... giving you a much smaller.. easier to deal with plant... but you can confirm that.. in the HP forum ...