Hi,
Vomitting or regurgitation by tortoises is always something to be concerned about. Its causes are many and include, being too cold, stress, obstruction of the digestive tract, spolied or wrong types of food (I have tortoises vomit commercial products that are otherwise healthy and be fine right after), high levels of parasites. If vomitting was due to a parasite problem, it would likely have a very strong odor to it. I would have a fecal sample analyzed by your vet.
What temperatures are you keeping your tortoise at and what are you feeding it?
There is also an online community dedicated to the African tortoise, specifically Leopards and sulcata. You can get much insight there by joining the group at:
http://groups.yahoo.com/group/African-Tortoise
Debbie
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Debbie (Zajchowski) Tellier
Director, Massachusetts Turtle Rescue, Inc.
http://www.maturtlerescue.org
Board Member, Asian Turtle Consortium
http://www.asianturtle.org
Moderator for Massachusetts Turtle Rescue's Online Community
http://groups.yahoo.com/group/Maturtlerescue/join
Co-Owner of the North American Box Turtle Group
http://groups.yahoo.com/group/NorthAmericanBoxturtle/join
Massachusetts Turtle Rescue, Inc.