Used this in a tank last year for about 6 months before I rehomed the fish and tore the tank down.  I have two of these pieces listed as my fish would fight over this one in particular so I had to buy two of them.  Had this in with African Cichlids and this tree has really nice sized openings ranging from 1.5"up to 3.5" on the largest opening.  This piece is quite large measuring approximately 14" long x 11" tall x 6 1/2" wide.  Any other questions please don't hesitate to ask.  Thanks for looking!