thank you. the floor bed is barebottom. before having them, i thought its going to be easier since i thought i could position wavemaker to blows the detritus away... im so wrong. i have 9 wavemakers installed, still have some dead spot that detritus cumulate. i usually suck them away every 2 weeks. so the key is... to clean them often. oh yeah, btw... for coralline algae, algae scrapper is your best friend. i hunt them down every week, before they are to big and too thick Sent from Singapore Reef Club mobile app