Unsafe. I went through the whole unibond / geocel / all other ranges and found that if its safe for aquarium, its a big plus to advertise the fact. So if it doesnt say it, assume NO.
Hi. Since you're from the US, check out bigalsonline.com they have aquarium safe silicone sealant. I've bought some from their Canadian site. They are a reputable online store. Here's a direct link: http/bigalsonline.com/catalog/category.x...ategory_id=1581
Hope that helps. At least you won't have to worry about buying the wrong stuff.