Lava Rock Rubble In Filter

grump299

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good morning I probably already know the answer to this but anyway I want to know is lava rock rubble in my filter as good as bio rings or matrix I have a full basket about 1.5 lbs in it.
 

86 ssinit

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I don’t use it but it’s very porous and many here do use it. I say go for it. Is this for a fresh or salt tank?
 

86 ssinit

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It should be fine. Some people add bigger lava stones into the tank to build up denitrifying bacteria.
 
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grump299

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Ya I have always had large lava rock caves in the tank but I have never used smaller pieces (which I have tons of lol) too small to use in the tank I have broken them up and filled a basket in my new filter aquatop cf300. I will use all the bio rings from my old fluval 204 and in the other basket and the bottom basket will have course and fine sponges in it.
 
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grump299

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0B70488A-37A8-4DF3-AC84-55123576FB1D.jpeg

Here is a picture of my tank as you see I have a big pile of lava rock on the left and a smaller one on the right behind the plant
 

NavyChief20

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I use lava rock in all my sumps instead of store bought garbage. It works incredibly well and has fantastic porous qualities. I have used it in all of the custom sumps and tanks i have built. Disclaimer i have a side business where i build custom tanks and filtration systems from 100 to 3000 gallons.
 
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