Please take my money!

[intarsiabox]

You can get those plastic mesh sheets in any sewing department that come in different square hole sizes, needle point mesh I think it may be called? Cut two sheets out the size you want, zip tie three sides closed so you can press on the top and bottom to open one side up to slip in the seaweed. Attach in your tank with a sealed magnet if you have one or a suction cup with a clip. I suppose you could use a plastic twist tie to seal the fourth side up but I don't think it would be necessary.