's not terrible, LS
would be better. CC
will trap debris, needs cleaned from time to time and it doesn't provide any low oxygen areas for anaerobic bacteria to grow. The bacteria that process nitrate into nitrogen gas need a low oxygen environment to grow. I would cycle the LR
add it to the tank and then scale back the filter. Not knowing much about your filter, if you can remove say..half of the bio-filtration media and then maybe a week later remove the rest. If thats not feasible then remove it all at once. Do you have a high bio load in your tank? If you have to remove it all at once, you may want to watch overfeeding and monitor ammonia levels...if you start to see any ammonia, do water changes to control. Seeing that you already have 50lbs in there, guessing you're gonna add another 50, I think you'll be fine.