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hi daniel,
i have a TS 130mm f7 which i use with a daystar quark. I don't use an ERF for the front. It appears that the website used to say under 150mm was fine without ERF at the front, but I think they have more recently changed the recommendation to 120mm. (the change being <6" to <5")
I use a 2" UV/IR filter in front of the diagonal and more recently added a 1.25" Player One ERF threaded into the Quark for some extra peace of mind. You could also stop down the front to 120mm quite easily if you wanted to, I had been considering it to change the f ratio (rather than energy rejection reasons). I recommend getting the tilt adapter if you end up going for the quark, it's much easier to deal with newtons rings if you have it.
I would use a mono camera for solar if you have the choice.
cheers
russ
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