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My fish went through one of those cups in half of an hour...
I put a clump in my 120g algae tank 3 weeks ago - but I think it is being overtaken by Hair Algae. Maybe an issue of too much light. I've got a lot of Chaeto, but it too has become overtaken with Hair Algae. The current light is an eBay 150 watt(?) LED plant light.
I was successfully culturing Gracilaria a few years back. My biggest haul was 3.5 pounds of the stuff. I took it to a North Jersey LFS and got a portion of black worms in trade. I won't make that mistake again... Unfortunately I don't remember the particular parameters of the 120g setup I had at the time.
The 120 currently houses Cheato (and Hair Algae). I had usually been running 6 to 8 ppm Nitrates . When I started up the current Chaeto filter I was out of nitrate test reagents, and wasn't in much of a hurry to buy more. As fate would have it, I was also assembling parts for a monster Algae Turf Scrubber in the interim. Then I got the reagents and a new Giesemann nitrate test kit. My nitrates measured 2 ppm on my photometer, and .5 ppm with the Giesemann. Now I'm nervous about building my monster ATS - I don't want to go to an ultra low nutrient system...