cycled tank

Is it a good idea to take a filter sponge Out of my 4 year old established saltwater reef tank to cycle new tank. How long should this take

hey i just finished cycling my 46 gallon fowlr tank all the test readings say zero i have a yellow tail damsel and i want to put in a clown fish dotty back bi- colour butterfly fish fireangle or coral beauty coral branded shrimp and snails and maybe a madarine down the line and a yellow tang...

My 120 gallon tank just recently finished cycling saturday morning. I performed a 20 gallon water change and my nitrates are still around 40-60 ppm. Would i be ok to add 2 small fish like a dottyback and a royal gramma? Or should i wait until my nitrates lower?

So I wanted to share my progress but also get some advice on the next steps, I am currently about 6 weeks into my new set up and tank cycle, reef tank intentions. I have a 55 gal tank, running V2 600 skimmer and have 2 koralia pumps (not sure of exact model but not the nano ones). Live sand bed...

Well, I moved all the water and Live Rock from my 110 gal to my 165. The 110 did the full shrimp/cycle with nitrites spike, then nitrates spike and was ready for a water change. I had it sitting waiting to be used in the 165. It was about 75g of water that was fine (ammonia-0, Nitrites-0...