New to site and growing plants....So I acquired a small Orthophytum Saxicola (at least that was what it was labeled as) from a sale at my local botanical garden. I have had it in the same small plastic pot that it came in. The guy I purchased it from told me to give it all the sun I could but water it more frequently than i would a cactus. I would say that my plant does not get as much sun as it probably should and that I water it about every 2 weeks. I have had it for about a month and a half and the tips of the plant are starting to turn brown and curl in. It also started to get some brown spots on it. What do I need to do differently to keep this guy alive? water more? transplant? more sun?

Thanks!