Is this Algae? I cannot tell.

What is this?

Also in the pictures is the nutrients we use.

It’s dirty. Whatever it may be, it should be cleaned before use.

Looks like sodium build up to me but should clean right up.

What's the temperature of your water? Algae will only grow if the water is too warm and the area is subjected to some kind of light source. If you single those two things out, then you'll know its something else. For instance, in one of my hydro buckets, the drain tube (clear tube) on the outside started to grow algae (green) in the tube because it was on the outside exposed to warmer temp and in contact with light. Algae wont grow otherwise.

Direct sunlight on your water holding tank can cause algae real fast. Ask anybody who mistakenly put a fish tank in front or near a window.

xIPhobiaIx said:

What is this?

Also in the pictures is the nutrients we use.

Click to expand...

Your answer starts at the 5:32 mark.