cycling tanks

hello does anyone have experience on using bacteria in a bottle on larger tanks (300-500 gallons) if so how did it go?

Ok just sealed my 265 and day by day i have added water and it is now full. I am planning on waiting a few days before i drain it (a few times) so that all toxins are gone. So now my question is if cycling it in my way will be good enough or should i do this dropping ammonia in it and watching...

I introduced 15 black neon tetras from two different sources, into a newly cycled tank over a period of 10 days, not all at once; along with three striped Raphael catfish. All appeared to be thriving; eating well, no marks, bumps, discolorations, bloating etc. They were placed into a 125 gallon...