Jc1119;5029436; said:I noticed on the site they say the stumps only weigh a few pounds and sink immediately, but being that they are so light, do you find that they need to be anchored down at all. My next tank will have a couple koralias moving a pretty good amount of water around the bottom...
Do you just bury them in the substrate or do you have them physically attached somehow?
They just sink. They're actually made out of a slightly flexible material. I have about 2000gph pointed right at one and it just stays in place.