Hey guys, I hopefully in the near future might plan on upgrading my 120 gallon to a 180 gallon when my kelberi Peacock bass grows. But the problem is I don't have anywhere near enough space to cycle a 180 gallon tank. What I want to know is since I'm using all the same substrate and sponge filters, if I used the same water as well (then just add another 60 gallons of dechlorinated water to fill it up) would I still have to cycle the tank? Since there would still be cycled substrate, sponge filters, and about 67% of cycled water. Also another slightly less important question. The guy I have my eye on buying the tank from is selling a 180 gallon with a stand and canopy for $850. the tank's about 8 years old btw. What I want to know is would I have to replace the silicon if I bought it from him? If so I'd ask for a price reduction. And lastly what should be the appropriate thickness of glass for a 180 gallon 2/3 of an inch? CAN ANYONE HELP ME ON THIS?