So, you must find some substance from vanilla Minecraft and insert it in isotope extractor. Wikipedia can help you in that case.
P.S. Can't wait for the update!
Thanks for the reply but i'm not asking about Lithium-6. I'm asking about the unnamed purple cell depicted in my screen shot.
**EDIT** Okay, using creative I found the purple cell is tritium. This is my current fusion reactor set up http://puu.sh/nTEz. Can anyone help me understand why my Lithium-6 is not being bred into Tritium?
**EDIT2** - I logged into single player and built a fusion reactor (http://puu.sh/nTOI). I have it wired with fibre directly to an MFE. As you can see, the center red circle fills properly but no power is transmitted. Any ideas on what I'm doing wrong?
**EDIT3** - Got the fusion reactor to transmit power in SMP but after leaving it running for 5 or so minutes, the lithium 6 and deuterium disappeared and no tritium spawned. Also, when punching the Fusion reactor, is the read-out provided supposed to function? I saw no notes in the SMP limitations about this not working.
**EDIT4** ~ Man this has been an adventure... I solved my problem. Looks like you have to use a charged battery to -jump start- the Fusion process. Keen!