so i have Harold my blue VT in a 2.5g tank that i just got him to upgrade his 1.5g bowl. i got red glass gem/pebble things that you can buy in the craft section at walmart. ive used these gems for YEARS infact ive only used gravel for my gold fish and now for our planted tank. the red pebbles TURNED THE WATER PINK!!!! my fiancee tried to tell me it was a reflection from the gems well i was still uneasy about it so i just checked it while i was doing my water changes >.< just wanted to let you all know that the red ones are no good. Harold is now in new water with his old clear gems. my poor Harold! i feel like such a bad mom!