yea i have a seaclone 100 here. I would really hate not using the cc as i have already had it set up but had to take down due to a dissintegrating tank! The sustrate was cycled for about a week, but that dont matter since it has been dried up, right? I could use the existing sustrate for planting material... Is it better to use sand because the impurities cannot penetrate deep into it? If I switch to LS, how much would I need for a 75 gallon tank?