I'm gonna be the devil's advocate here and say there's no reason to get rid of the lion or eel. They will not bother your corals if you are serious about going reef. They are listed as reef safe with caution only because they may eat any mobile inverts. Any shrimps or crabs like emerald crabs are at risk of being eaten. The maroon clown will be a problem since it's already established and my not take kindly to any newcomers to your tank. As for the hermits the eel may or may not bother them. My lion and eel have never bothered snails though. Nassarius snails are wonderful for cleaning up left overs that hit the substate but they don't eat algae. Some turbos or margaritas are good for that. To address your hermit color question, I have no idea. One is probably better at picking algae than the other. Try a few of both.
Lastly, for your tank set up, I would ditch the aquaclears. Just my opinion of course but I would get another 30lbs of live rock, four maxijet 800's to place around the rock for waterflow and get a good skimmer. With the lion and eel being messy eaters and being in a reef setup, a good skimmer in my opinion will be an absolute must. Not something you wanna skimp on. Not sure the seaclone 100 is big enough for a 75g tank. I've seen beautiful reef setups with eels and lions but, they are a bit more work, more water changes and you are gonna be absent all the interesting mobile inverts that help keep a reef tank clean (shrimps, decorative crabs, slugs, etc.) Or, you could just return the two in question and go for a community reef setup. This will give you more options on inverts as well as fish. Good luck.