Tault_elemex (!empty($user->lang['WROTE'])) ? $user->lang['WROTE'] : ucwords(strtolower(str_replace('_', ' ', 'WROTE'))):
Just lvl to 70++ and join those Sky or Hnmls or w/e that splits money item.
Actually, if I may say something (at least on Asura it is like this), any and all Sky/HNM shells that do sell/split are looked down upon (especially Sky shells). I'm not saying all shells are like that, but the two major known ones on Asura like that (VikingSP and Legends) both have horrendous reputations. Also Sky is hell for a blm without some of the drops it gives/Iqgira set.

Also, the profits in Sky counting farming pop item NMs makes the gil/hour horrendous.
If you want to farm Uragnite shells (drop off of Coralline Uragnites LvL 32-35 in Purongono like you said), it is vitally important you go as /whm or bring antidotes. The poison is like 15-25 hp per tick (can't remember exactly, sorry^^). These guys have two stages. One stage is when they are standing up, and not hidden under their shell. Your nukes and melee do full damage during this stage. When you do enough damage or after a certain amount of time they will hide under their shells and nukes and melee will be resisted (melee for 3 or so, lol, Blizzard III for 256). They have a regen here, and do an AoE poison move. Go ahead and sleep them and rest while they are shelled up. Once they stand, aspir and Thunder III again. Drop rate is fairly bad, but if you sub thf and bring antidotes, you will stand a much better chance.
Other possibilities for Blms your level are leveling low level jobs and BCNMing with the seals you get from it. Beastmaster is great, take it to level 10, charm {Easy Prey} pets and have them fight other eps, while you farm eps w/ axe melee. Use the seals to BCNM40/60, 60 has better drops, but obviously takes more seals.
Once you hti 73 a more "disreputable" moneymaker is getting a static of 5 blms who do Operation Desert Storm (KSNM30) with a random 6th person who normally wouldn't do ODS. The Blackmages
usually charge 50% of all drops over 1 million, and give the other 50% to the melee. Takes maybe 1hour per run (you can take multiple melee and have them wait) and you can make easily up to 5mil per hour with some luck. However it can backfire and you'll make 100k or so.
Lastly, don't ever forget you can always use the simple farming as blm/thf, jugner forest is good, farm beetles at the pop nm area.
Feel free to send me a PM if you want me to elaborate.