Under gravel filter - how much gravel?

[Demonknight]

Personally I like the idea of the coffee table tank, I personally love looking down into the tank as it reminds me growing up and laying down on a bridge to watch the fish swim by...forgetting to try and catch them.

 

[jpchin]

the product is fresh trace by seachem. you can google it.i use a ratio of about 2/3 ro to 1/3 tap water. i adjust until i get a ph of about 6.3. i do a water change every 3rd day.