I'm trying to not feel too smug until I go back tomorrow and (hopefully) find a dry floor but I'm well pleased it's up and running. The only issue I've found is the weir isn't water tight. It doesn't seem to have affected the system flow but I realise it will likely render the safety feature of the weir preventing the whole tank from draining in the system fails obsolete. As draining and re-siliconing isn't practical any thoughts on using reef putty along the joins or other suggestions? The missing corner will be in place before fish go in of course!