I’m still New to all this, and honestly don’t know much about cycling rock. However I bought my tank used, and got the fish and everything that came with it. I kept as much of the water as I could. It was a pretty long ride back home, and when I got home, the temp of the water was down to like 60 or so. Only had two heaters and three buckets of water I needed to heat back up as quick as possible to get the fish back into the system. I used a heat lamp and a power head to heat up one of the brutes with water in it. I’m sure it’s not optimal, but a heat lamp will work.