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What elso you gonna put in there? LR I presume too? Gotta consider the 1" per 5g issue too.
Anyway, I'd think more info is needed to answer you. Not that I'll be answering, I'm just thinking folks'll need more info to help you, but my first question'd be a good start.
We have a 40-gal tank. When we had 8 fish & no LR, and were overfeeding, we had problems - ammonia spiked, fish died. We cut back to 5 fish (varying sizes), added LR, tank stable & fish healthy. We have less than the recommended 1.5lb/gal LR content, probably more like .75lb/gal, but it sure helped.
I don't claim to be an expert, but that was our experience.
- Bob Peitzke