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First I'd suggest you do a custom white balance (probably using a grey card) that will help. Secondly, if the blue cast second filter was removed then you are open to full spectrum IR/UV, a simple UV/IR Cut filter will help (this cuts off the IR after the Ha spectrum point). You can get Baader screw on filters (2") that will fit most T-Adaptors, or ou can use the Clip in filters. I use the screw in filter simply because I had one already.
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