Will you move the tenant to a hotel and pay for that while the invisible mold is removed?

Equity is invisible...and can disappear as fast is it was calculated.  

An LLC is like an invisible shield that stops anyone from suing you.

David Jacksone made another good point, just because you can invision someone paying your for information doesn't make it a marketable enterprise, they can call property managers and tenants usually don't see that as costing them anything.

You will see water usage drop 25% at a minimum doing this as the cost is not "invisible" to them anymore.Submeters can be purchased and installed for $150 each, and would pay themselves off in under a year.  

Some standing water is invisible you know...All that complaining aside, If mold detecting is cheap $250 or less I would just go ahead and get it checked out. 

If you can, try to take photos of black light or similar showing 'invisible' bodily fluids and ask the landlord to be reasonable.If it really really bothers you, get a quote from Home Depot and ask the landlord to split the cost to replace the carpet.

However, attempting to scroll though the list causes it to become invisible.

People and institutions must face the manifestations of failed investment to remain consistent with the same principles that have forever been the foundations of American prosperity.The Invisible Hand, in reality, pays no heed to emotion in its unformulated natural guidance of the markets.

It will be nearly invisible and cost less than $10.