Thanks Homer, its still in the planning stages right now as I'm about to go away for 3 weeks (don't worry my tanks will be maintained by my dad).
maybe some time away from my cichlids will make me appreciate them more, but right now Im leaning more towards stripping out the stock and converting to brackish.
It's a shame because I really like my Flag tail Prochilodus, I'll miss him. as for the fish in my Avatar, him and his mate will be going in the puffers current tank as a species only breeding tank.
Most if not all of my fish stores sell their brackish fish from freshwater, so I will keep the tank at fresh water to begin with, get some stock and then when I know I won't be getting any fish for a while, I will start increasing the salinity.
Would probably start with this stocking
x3 Archers
x3mono
x3 scat
x2 GSP
x2 columbian catshark.
Some mollies (for colour and because all the fish will be small growing up around the mollys will make them view smaller fish as copanions not prey).
I plan on expanding the numbers of the fish as time goes on to about 5 archers, and maybe a few more scats and monos.
Other suggestions I can think of adding at some point would maybe be, Dragon goby, Jade goby, other puffers (avocados would be cool).