Black/green mold?

Long time crawler, first time grower, first time poster here....

Alright, im on my first grow here using a flood and drain system in hydroton. I've recently noticed that i has small amounts of (mold?) growing in the corner of my flood table. i have new clones about 15 days old planted and yesterday i noticed that 2 of the rockwool cubes have a greenish black slime on them and both of them are the healthiest looking plants. i just wanted to know if i should worry about this and if so what products i should use that are safe??

sorry about blurry pic will take another in a few mins

if its green its only algea due to the moisture and light. it shouldnt be a problem but black, idk then i could be mold.

If it's algea is there anything i should worry about?? There is nothing in my res either but its light sealed.

I use the same set up don't worry about the mold or the alge. just scrape it off and you will be fine it can't hurt your plants at all.

Your koo it's algae cover the rockwool cubes completely with the hydroton and it wont happen any more as long as light doesnt get to them.

Awesome! Thank you for your help. If I have anymore questions that I cant answer by reading I will post again. Thank you again for the help.

put something over the mold to cover it, no light no photosynthesis