Just purchased established 125g for new build - need advice

[reefan4ever]

After being in the hobby for 11 years and out for the past 4, I am finally back in and working on a 125g build. This site has been awesome for all those years and I really appreciate all the help you guys have given me in the past. Today, I purchased an established setup which included 150lb of LR and an approximately a 4 inch sand bed (4 full 5g buckets). I need to store the LR and sand (debating whether to keep and clean or toss). I definitely want to save the LR. I need about a week to finish the stand and clean the tank and 60g sump. I put the liverock in two tubs submerged in the former tank water with powerheads in each.
http://s1078.photobucket.com/user/robavery/media/125g%20Build/Liverock_zpsiudbtaax.jpg.html
My questions are:
1) Will this suffice for a week or two?
2) Do I need a heater in both tubs? Temp is about 60F outside.
3) Any other recommendations for the LR storage? Light or no light?
4) I am leaning towards thoroughly cleaning the sand but I'm not sure. There is definitely detritus especially in the sand from the sump/fuge.
Thanks in advance for all of your help.

[reefan4ever]

Here is the pic.. didn't come through on the first try.
http://i1078.photobucket.com/albums/w490/robavery/125g%20Build/Liverock_zpsiudbtaax.jpg

[james30ct]

I think if you leave the rock in the dark for a week stuff is going to die. If you're planning on using it as live rock in a week I would light it and heat it IMO. As far as the sand do you know how old it is?

[reefan4ever]

About three years old.

[Mouse]

+1 on heat for LR

Do you want sand? If so How much?

[CafeReef]

Personally, I'd toss the samd and start fresh, heat and light the LR

[kmbyrnes]

New sand all the way. Sand will have to be washed either way, so start off fresh.

[jonwright]

Heat and light.