Anin,
This thread is about the construction of a (3) standpipe overflow that is virtualy silent and has many fail-safe features. The standpipe design is most commonly used with a "calfo" or "coast-to-coast" style oveflow box. It will work with a 55G tank, but will take up a fair amount of realestate. You may also want to note that many 55g tanks are tempered all the way around (can not be drilled).
Durso or similar standpipes can be quiet, depending on the configuration and flow they need to process. They many times need frequent adjustment.
Any standpipe system usedwithout an oveflow box will be very poor at surface skimming.
It would be best if you started a "help with my overflow" type of thread. You will get plenty of responses and opinions to help you move forward with your setup. If you want to attempt to use this setup than stick around and ask questions
