Mould under lifted tiles?

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I’m continuing to lift tiles on my dot & dabbed kitchen floor over retofit ufh. i thought I’d start a new thread due to what I’m finding underneath.

A few tiles have green mould looking spots & bits of water & this one is by far the worst. Taken up just now with my trusty plastic car trim removal tool. It took less than 30 secs to lift - same with most of the others.

Is this mould? & what would cause this?
There are a few spiders living under the floor & loads of tiny tiny spidelings.

Tia
 

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Last edited:
Other mould pics. I really cant believe how bad this workmanship is!
 

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Probably algae rather than mould.
 

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Mould under lifted tiles?
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