I have siphon/cleaned all the sand bed I can reach in my tank. The bed was four years old and quite compressed, as well I was having an algae problem on the bed.
I did not remove sand tho, I think that would stir up way too much crud. I just used a python, and then poke a section, slowly let the brown dirt rise to the top, and the clean sand fall back down. With just a gravity siphon even the worms drop back to the bottom.
BTW, my LTA is very shy. I can vacuum all around the sebae and it could care less about my prodding, but if I touch the LTA, it reacts like I'm trying to kill the poor thing.
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