The only maintainance on a scrubber is slight trimming, cleaning of the acrylic shields, and replacement of the bulbs... in terms of incorporating it...there's numerous ways... search on here for "diy turf scrubber" and check it out.... def more than worth the trial and error. In terms of the wishlist, volitan lions can easily reach 12-15" in length.... once they are that big, they will most likely gulp anything that they can fit in their insanely ginormous mouthes.... its crazy what they will eat. The marine betta would prob be ok with a lion ...until the lion gains size. Most people and articles I've read say it only takes about 15 months for a volitan to reach a decent size.as for the radiata, I believe they grow to 9-10 inches... which is a little bit more manageable. As for the other fish im not sure. Again sorry for the late reply
**edit** if you don't get an aussie tusk, im stealing your tanks while you sleep...deal?