That way you wont spend your life trying to syphen them clean. I harvest from one a day. the night before i will feed the enrichment and i will replace with clean saltwater whenever i feed out. then when the day is done and i have fed from that culture three times that day, i give it until aprox 36-48 hours to regenerate. I am not supporting a ton of fry right now so the three half gallon glass containers suffice. If you need a whole lot of rots then the 5 gallon tanks would suffice but imo, its too big for a home hobbiest. You would also need to give the rots a week or so to fill up that amount of water before you harvest.
Also clownfish are rather prolific spawners and raising their larvae will require large rot cultures. Start one culture first, when that gets to a good working density, harvest some and start the second culture. With both cultures up and running full steam, you can harvest half the culture every other day by alternating which cultures you pull from. Siphon the bottoms of debris as needed, your looking for reasonably clean but not sparkling clean. Rot's seem to do better in slightly dirty tanks than in sterile set ups. Using only live phyto, I can keep a culture going 4-8 weeks without needing to restart. Use of dead feeds like Instant Algae are a bit trickier and need cleaning more often. Monitor the health of rotifers using a strong magnifying glass. When you see an upswing in the proportion of males, it's time to use that 3rd tank and start a new culture using about 1/4 -1/3 of the water/rots from the old culture. Now is the time that you really clean that old culture tank and place it in reserve for restarting the next one
Just finished scraping coralline with one :lol: 
