"Strong vs. weak:Follow this link for a more explicit not so troll answer http://en.wikipedia.org/wiki/Precautionary_principle
Strong precaution holds that regulation is required whenever there is a possible risk to health, safety, or the environment, even if the supporting evidence is speculative and even if the economic costs of regulation are high.[12]:1295–96 In 1982, the United Nations World Charter for Nature gave the first international recognition to the strong version of the principle, suggesting that when "potential adverse effects are not fully understood, the activities should not proceed." The widely publicized Wingspread Declaration, from a meeting of environmentalists in 1998, is another example of the strong version.[13] 'Strong precaution' can also be termed as a "no-regrets" principle, where costs are not considered in preventative action."
Aren't tortoises (or any animal in our care) top priority? I think if something may result in illness/death you should never do it.