I’ve had a 35 gallon cube going for about 5 months and an fluval 13.5 about 8 months old. I’m upgrading to a 60 cube and combining them, should I start over or can I use my old sand and water since it’s not that old? I will be using my rock even though it has some hair algae. I will clean it in a tub before transferring. Just not rich enough to buy all new rock (will have to buy a little as I only have about 50 lbs) and I can take the good with the bad.