That is what I miss about it, when I was fiddling.. the knowledge that I gained about the WORKINGS of the systems, that is knowledge that I have stored and have a hard time retrieving these days. *grin* My recall system isn't what it was when I was younger.

I do remember being fascinated however at the fact that I achieved the cleanest aquariums (I NEVER had to clean them out.. their systems worked like nature intended) when I used sand as my bottom material instead of rock and a home made under"ground" filter. You can't do that these days the way the under"gravel" filters are made, they would clog up.

You have a very interesting journal, would you mind if I added you to my friends list?