I wonder how large tanks should be maintained. For example, should a tank as large as 75 gallons be maintained in the same way as a 30 gallon (or less) tank? Meaning, could it use the same types of filters that smaller tanks use, such as AquaClears, BioWheels, etc ...(only of course larger)? Or do large tanks require some special and different maintenance? I have often read about some special pipework and special filtration systems required by large tanks. Is that necessary? What is this all about? What about tanks that range from 75 to 125 gallons? Any special maintenance requirements for these?