i just started a 20g tank its been running for about 3 days now, i used about 50 percent water from my 55 thats been up over a year and 50 percent new , my question i plan on moving rock and corals into this tank from my 55g , should i be worried about anything and will i get a spike and kill all my invertes when i transfer everything over , new to doing anything like this and want to make sure when i transfer everything i don't kill it.