Substrate clumping

[Oceanic]

Originally Posted by martym

What causes this and how to stop it?
Thanks

Usually this is a sign of Calcium carbonate forming in the substrate sticking everything together. I had this in my old tank once. Not sure how to prevent it, my tank has no sand so i don't have to worry about it!

[Marlin65]

Not a good thing more flow will help and something to stir it up a bit.
How deep is your sand anything less than three inches is useless especially if it is larger grains.

[Aquattro]

Originally Posted by Marlin65

How deep is your sand anything less than three inches is useless especially if it is larger grains.

Useless in what context?

[Marlin65]

Originally Posted by Aquattro

Useless in what context?

For NO3 reduction you need a min of 3" anything less will just turn into a nutrient sink.

[Aquattro]

I'll start a different thread on depth later on

[Marlin65]

I take it you don't agree.

[Aquattro]

Originally Posted by Marlin65

I take it you don't agree.

Well, yes and no. Kinda. The thing is, I don't think you need sand at all, and if you use it, is 2 inches bad where 4 inches is good? If so, why? If not, why not? Don't worry, we'll get our own thread going