yeah i had the exact same problem as you, bought gravel, had loads of stones. I removed them all and it was a lot easier. Sand stone must be ok but you dont know for sure unless you get it tested. Its better just to, as I did, remove everything, buy some sand or gravel that either lowers or has NO effect on ph. If it says it does not alter ph it could still act as a buffer. remove the decoration as well as precaution. sand and wood and leaves. it looks really cool as well, but your water does turn tea coloured but I also think this looks good. I'll post you a pic of my tanks if i can borrow a camera.
Last edited by uberape; 02-10-2013 at 06:19 PM.