I don't believe ls is necessary, but it definitely speeds up the process. As far as weight is concerned, carib sea's new ocean direct is virtually dry in the bag, is in breathable plastic, and with free shipping and foster's price, is extremely cost effective. Also, is dated.
Because of these reasons, I used all live in my new 56g. No cycle measurable on api tests and all sand was shipped in temps close to freezing. Didn't rinse, or run any type of filter or skimmer. Just a powerhead and used sand bag over sb to keep from stirring up while filling tank. Was crystal clear in two days.
Just wanted to add since things change and biased people don't keep up with information on the other side. This whole debate needs to start with current information not past experiences. Look at current live sand prices at foster's which they ship free under standard 50 dollar minimum as dry goods. Look at dated bags. Breathable plastic that keeps sand live but has minimal moisture. And finally, ocean direct by carib sea in it's patented packing is supposed to preserve 1000 times the life of a sealed package with water. Also, if kept cool, this is no different than pods or phyto or anything else we keep alive in the fridge.
So many things in this hobby follow this pattern. Because an argument was accurate in the past, people tend to assume nothing has changed, so their arguments are still valid. Then the majority join in and people don't argue when they know better because people set in their ways rarely listen to reason and logic if it conflicts with their beliefs.
I took it a bit personal when someone said noobs are wasting money buying live sand and dry rock as a current trend. But this statement proves in itself that no research was done. I may be a noob, but I do very thorough research before making any decisions. Being a noob works to my advantage because I am able to research and compare products and ideas with zero bias. This keeps me from getting confused by outdated information that biased people try to preach with.
Sk8r, I love reading your threads and stickies. You offer great information on useful subjects explained clearly and thoroughly. That's why I took the noob trend comment so personally. I hope this thread doesn't turn to a sticky. I think it is truly bad outdated information with some important and helpful facts mixed in like the 1lb per gallon rule being for dry sand. Really though, even that is outdated. How much sand you need is decided by length and width not gallons. Also need to factor in rock scaping plans. The best way to calculate is using formulas from the manufacturer since different sands have different densities. Also, note that manufacturer's no longer recommend weight per gallon because of the reasons I mentioned.
Hopefully you don't mind that I called you out, but feel it is important. Simply, because myself and many others have a ton of faith in everything you say and post. Specially in the case of noobs, live sand is a very good idea. As all the experts know, it can be chaos in the beginning. Noobs should be wise enough to spend a little extra on things like this that can aid in buffering noob mistakes. Happy reefing!!