The friendliest place on the web for anyone with an interest in aquariums or fish keeping!
If you have answers, please help by responding to the unanswered posts.
Where can I buy LR Rubble online? Can I just use smaller peices of LR in a SUMP? What's the differanct between the two? Peolpe have suggested cleaning it...how offten and how?
I get my rubble from the bottom of my LFS's LR tanks. Others just get a normal piece of rock and break it up with a hammer and chisel. I think most people like myself get rubble to put in our canister filters. I would say that if the pieces you have fit into your sump, just use them.
None is needed if you have that much LR in the tank. If you want you can add it but IMO not needed. I have none in either of my sumps and all is fine. I also say that it will trap waste over time like bioballs so that is why I don't have any in my sumps. Add it to the back of your tank behind the LR, it will give the pods more places to hide and reproduce.