Tiny Black Worms living in our Shower PPLLEASE HELLPP!!!@?

In our shower we have this gap under the shower and theres lots of mold ad algae living there.
I don’t know how to get rid of the algae. I tried EVERYTHING to clean the algae. I scrubbed and scrubbed for hours and hours with bleach and the algae and mold wont go. So i just left it and a few weeks later tiny black worms started growing under there there from 2mm-10mm long.

Its really unhygienic and im too scared to clean it because its really gross.

The gap is too small to clean the worms and algae so i tried pouring bleach and then boiling water but that isnt working.

PLEASE HELPP@@!!


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