Is Mortar Safe for Fish

Yes it is safe. I have used it twice now. The first was in a 29 to make a back wall for a mantis shrimp that lasted around 2.5 years old. There was no pH spike in that tank.

Is mortar safe for aquariums?

Yes it is safe. I have used it twice now. The first was in a 29 to make a back wall for a mantis shrimp that lasted around 2.5 years old. There was no pH spike in that tank.

Can I use mortar in a pond?

You can add mortar over a pond liner to add strength and you can add rocks and decorative elements to it. Adding the mortar is a simple process, but it is important to keep the mortar wet during the curing process to prevent cracking. Always wear a dust mask, eye protection and work gloves when working with mortar.