Are you sure that sahulensis is a skull creek? Looks quite red, skull creeks are more of a light orange to yellow.
Spotted blue eyes and the Maccullochi group go well. I've kept them with Wilsoni, Maccullochi, Papuae and Sexlineata, with only sexlineata not working out well.
Is that Rhad one of Leo O'Reillys 'morphs' of rhads? And even so it looks more like a Teewah Creek 'Ultra red" compared to Searys Crk which tend to be more blue.
The rhads will fight with the Gertrudae, Any of the long finned blue eyes will be pecked at. Only really Mellis and Signifer pair well.
Make sure that you don't put aggressive rainbows with peaceful ones. G. Pseudoincisus will rip anything to shreds, and M.Sexlneata can be nasty as well.
I've lost a large (~10cm) P.Furcatus to a Male M.Kamaka fighting for dominance.
Some of the larger species like Regals (trifasciata) and Boesmani can be a-holes so be careful with them.