Like most beginners, aquariums have become like potato chips - couldn't be satsfied with just one - but I now nderstand the virtues of one large tank versus many small in terms of the amount of work/maintenance, and I am going to start a 55 gallon tank and merge some of my exiasting tank populations. My question is, can I use the existing water in my 29 gallon to the new water of the 55 gallon and transfer the existing residents of the 29gallon with it to the new tank for the first four weeks? Then add the other fish once the 55g tank stabilizes in terms of ammonia/nitrogen? I'd be grateful for the feedback!!