Ok here goes. I have just recently setup a 10 gal fuge. I added the sand and now its totally cleared up and i am ready to plumb it. Just today I aquired about 10 lbs of LR rubble ranging in size from fine to crushed coral size all the way up to some pretty good sized chunks. I put it in my 20 gal QT tank to keep all of the critters alive. So my question is...would it be ok (in your opinion) to add this rubble to my fuge on top of the existing sand? BTW the rubble is all cured.