Red slime?


New member
I recently discovered red slime on/near sand.

Anybody know why this is happening?

I recently added sand to my tank. Could this be why?.

What do you all recommend that is reef safe? Any chems?

Thanks in advance


New member
Most probably it is due to the new sand! How old is your tank? If it's new which I think it might be since your just adding sand or are you switching from bottomless?
I wouldn't recommend using any chemicals. If your tank is newly setup you can expect to see some red slime occasionally until the tank stabilizes. I would recommend you just siphon it out in any case.
If this does not apply then give us some info on your tank,filtration, setup, etc! :)


Premium Member
If the sand is new, I agree that waiting a bit is a reasonable approach. At some point, you might need to look at nutrient control. The chemicals all have some risk attached to them, and usually are just a temporary bandaid.