Lava Rock

[MrTony1920]

Would a lot of Lava Rocks be good for a pond? Thank You

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[BKHpondcritters]

Lave rocks used to be the 'go to' for putting in a Biofall (biological waterfall filter) in a mesh bag due to their large surface area for bacteria to colonize on. Trouble is, they're heavy - really heavy - which makes them hard to lift out when necessary & also tend to tear the mesh bags. Now more user friendly options exist in the form of oddly shaped, plastic 'balls' and/or other manufactured items.

If you're talking about putting them in the bottom of a pond, I wouldn't. They would be awfully uncomfortable to walk on & are too sharp to put on a liner safely. Small, round 'river rock/pebbles' or pea gravel is a better option in this situation.

 

[MrTony1920]

Lave rocks used to be the 'go to' for putting in a Biofall (biological waterfall filter) in a mesh bag due to their large surface area for bacteria to colonize on. Trouble is, they're heavy - really heavy - which makes them hard to lift out when necessary & also tend to tear the mesh bags. Now more user friendly options exist in the form of oddly shaped, plastic 'balls' and/or other manufactured items.

If you're talking about putting them in the bottom of a pond, I wouldn't. They would be awfully uncomfortable to walk on & are too sharp to put on a liner safely. Small, round 'river rock/pebbles' or pea gravel is a better option in this situation.

I was think of get some big ones to make cave for a crayfish.

 

[BKHpondcritters]

I guess they'd be fine in that application. Just make sure to protect your liner with extra underlayment. Also, if you have fish & they spawn, bashing into a sharp lava rock cave/structure could possibly cause injury (even more so than regular rocks) Just a thought...

 

[Mmathis]

IMHO, there are other ways to provide an enriching environment for crawdads (as we call them here in the southern US). I would suggest that you do more research on any and all critters you are planning to keep. Sometimes your research alone will provide the answers you seek. I found this article on keeping them in an aquarium, so it should be that they are easy to please. Now, when looking this up, I did come across something about one called a “cave crawfish.” I didn’t know this, but this type is not the common one we find in a ditch, but are a federally protected species native to certain parts of Arkansas.

What Is Needed to Keep a Crawfish in an Aquarium?

Crawfish are not difficult to keep in an aquarium, and they're interesting pets to watch. They can be purchased from many pet stores or caught in their natural habitat. Also known as crayfish, there are many varieties to choose from, such as the blue crayfish, Louisiana crayfish and dwarf crayfish.

pets.thenest.com