Actually it was small and yellowish in color. I scraped all that I saw off. I found two small mushrooms that were also yellow in color. I of course took them out of the viv ASAP. I have no pet currently living in the viv so I have also put in some sow bugs. Not sure when I will be getting another Chinese Water Dragon but I will keep an eye out so this problem doesn't recur. The mushrooms seem to confirm that this isn't algae. Not sure what it is but hopefully with the change in bedding/soil and the removal of the existing spores it has been taken care of.

Renovator, was a comment removed? Because other than where you started, down, I don't see anybody ridiculing (or maybe you were talking about me? where I specifically said, IMO, and specifically addressed the question of whether or not they should have walked away?) Now, it has been side-tracked. But I don't think it had been until that point. Your answers on this forum are very helpful, but sometimes very objective. This person specifically asked both an objective and subjective question. They will get subjective answers. This person also has not stated, at all, where in the world they are located. And, whether mold might be a normal thing in their environment (to which I'd say, mold is everywhere, even deserts will have some sort of fungus growing there. It is the nature of nature). To say that those with asthma, etc could have problems even if it is non-toxic, while true, is misleading. Those folks will have problems no matter how their house is constructed in certain environments/ localities in the world. The OP said there was nothing found wrong with the ventilation and the suspected source was prior to the build and final construction. HOW MUCH MOLD (do you have a picture)? Finally, the usual way to remediate mold is actually to not use bleach (only). Mold remediation companies know what to use and would be better to hire than trying to DIY it and assume that you know that "bleach kills everything". I do second the suggestion to get a second opinion from another mold remediation company. (Just remember they will be interested in selling their services to you). However, I suspect at this point, in order to do that, you will need to re-enter contract with these sellers (to get access to their attic) and they may not trust you. Finally, you may want to get the RE opinions on this matter in the buying and selling forum since at least one of your questions pertains to future resale value.

What they do is to drill holes in several places in the slab and insert a special device which reads relative humidity. Contractors working hundreds of thousands of square feet of concrete work in new commercial construction projects use this type of testing method technology. If I was still doing work over concrete, I would surely add testing to a new flooring quote as protection for both myself and the customer. That said...you also will need to discover the source of the moisture and take whatever steps necessary to fix the problem. However, the flooring contractor assumed responsibility for assessing the jobsite conditions before starting any work.

We have the same issue too. 2nd story window. Had a moisture company come out and didn't detect any moisture on the outside. Had it resided with LP Smartside and installers saw nothing. My husband and I just ripped off the trim last night. I can't let my kid in this room anymore. We found one spot. Smack dab in the middle of the window between the two different panes. These are vinyl windows. The pictures actually look worse than in person. Could just this little bit make this big of an odor? Is this the install or the window. We just resided and wondering if they'll have to take the siding out and we'll have to redo that too. We're going to do whatever we need to do. Does anyone with experience think this is a flashing issue? A crack in the window. The water does weep out of the weep holes. It looks darker than it is because I did a bleach wash.