I have a really big siphon it's the 24 inch and I thoroughly vacuum through my sand and mix it every week that way. I use pool filter sand and when the sand gets half way up the siphon tube I just lift it up and it tumbles back down like the gravel did.
I love the sand so much I am converting my 175 bowfront also I removed half of the gravel yesterday and will remove the other half next week so it doesn't hopefully screw with my cycle. My tank runs 2 wet/dry systems tho so it has a really good bacteria load
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