View Full Version : small rock from freshwater tank can use in saltwater tank?

09/16/2017, 06:21 PM
can I use this small rock instead of sand?


09/16/2017, 07:16 PM
Not a good ideal,multiple problems.

09/17/2017, 07:32 AM
I don't know what type of rock that is, but generally it is a bad idea. Most will leach heavy metals back into the saltwater, killing corals and even fish.

09/17/2017, 07:52 AM
Stick to aragonite based substrate. If you feel the need to have a pebbly substrate than you can use crushed coral but keep in mind that anything that size has a habit of trapping food and detritus and can cause nutrient issues down the line.