Good morning all, i'm new here and so firstly would like to say hi to everyone and look forward to reading many of your posts etc. Secondly as my subject says I'm in the process of getting my pond up and running but my question is can i use breeze block in the water without harming any fish (when i eventually get them)...i want to use a piece of purple slate in the pond under the pump to create something a bit difference but will need it lifted up on something and thats where i thought the breeze block upended might come in useful. Your suggestions would be very much appreciated.