Flatworms won't die!
Thanks to all for the help with the pest identification...I went to J&L and got the Salifert Flatworm exit and some carbon. I siphoned as many as i could firstly (use a turkey baster to blast all the nooks and crannies as well). I put in the recommended dose plus an extra drop or so, waited about 45 minutes and they started dropping like flies. I siphoned out as many of the dead ones, did a water change and then added the carbon to the overflow. I waited a couple of days and noticed that there were still about 20% of them left, so i did the same thing (same dose) but no water change this time. That was yesterday and today there are still about 50% of the remaining ones left.
Do I just keep repeating this every couple of days or do I need to take another step of some kind? 
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Fluval Osaka 41g sumpless tank, 250w MH + 130W PC , DIY HOB refugium, Tunze 9002, Koralia 2, Koralia Nano
Toad Stool
Colt Coral
Purple Shrooms
Red Shrooms
Candy Cane Coral
Hammer Coral
Moon Coral
Copper Banded Shrimp..and growing
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