Observations on
LR rubble:
I have about 10 lbs of rubble in my
sump in a two special flow chambers (fed by my
skimmer outlet). I've never had problems with stuff getting trapped per se. I've tried to blow out the rubble using a turkey baster, but hardly anything blows off. Maybe there is enough flow to keep any
detritus on the move. Maybe most of the debris settles in my
sump's main chamber (or inside my
skimmer) before it has a chance to reach the
LR rubble chambers. Not sure. A tiny bit of
detritus ends up settling in the bottom of the first chamber, but most settles in the last empty chamber where I can easily remove it during my weekly WC. I have seen sponges, tunicates, and various pods, and micro-feather dusters develop in the
LR rubble, so I believe it has been beneficial for my system.
When I had a 24g Nanocube, I had
LR rubble in the first and second chambers as well. In there I remember a LOT of debris getting kicked up when I used a turkey baster once a week. I just made blowing it out to be one of my WC preparations. I would even get in there with the siphon tube (after the turkey baster) to draw out the cloudy water. Cannot say how effective the
LR rubble was. I do not remember seeing any sponges, critters, et cetera in those chambers when I disassembled the system, so the benefit was not as evident.
