I ended up stirring up the sand loads, waiting for it to settle and setting up 2 hosepipes to do a water change....
One for water in, one for water out
I Have moved all my filters and fish over from my 3ft and it still looks empty!
25-30 Malawis
2 Frontosas
3 Firemouths
1 Krib
2 convicts (Breeding Pair)
1 Plec
1 Black Ghost Knife
1 black/yellow thing
2 Jewels
2 silver sharks
4 neons
Those are all the fish I already have but I will be researching what can live with what (even though they all get on so well and have lived together for a month or so now) and selling some.
tank is 6ft x 2ft x 18"
Pics of how it looks about 3 minutes ago....