yes it would be best to ultimately replace the bioballs with LR rubble over time... preferably a few weeks. maybe a third a week? I like to use pieces of rubble that are arguably golf ball size. make sure you remove the false bottom of the second chamber so there's more space for rubble.
there's a few other simple mods that can be done to improve the saltwater function of the BC.
1st chamber:I removed the stupid carbon filter stock pad and replaced it with a sock full of carbon (easier and cheaper to refill with carbon). I also stick a visitherm stealth heater in there. WIDEN the gap between chamber 1 and 2... do not make it deeper. I used a pair of wire cutters.
2nd: remove false bottom and fill with rubble as above. the bottom piece might stick a little; I had to use a bent coat hanger to get it out.
3rd:replace stock pump with a maxi-jet pump... can't remember which one would be appropriate for a 29g BC.
I also took out the stock flow difuser and tuck in a y-piece and loc line to split the flow. you can vary this piece however you like. I like having one with a narrow diffuser to stir up the surface and the other end pointed at the front of the tank.
unfortunately I can't think of any simple or cheap mods for lighting. nanocustoms and nano-reef.com should have a lot of good ideas though.
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