I have been searching high and low for plastic mesh for weeks but have had no such luck so last night I went rummaging through my fathers garage and found a fishing net that he used back in the day, anyway I didn't think the netting would be big enough but I tried it anyway and to my relief it fits perfectly in side my 2.4 tank :) I just hope it works, fingers crossed. Its not as tight as I would have liked but my sewing is rather amateur actually very amateur, I should have paid more attention in school lol.
It actually did look like a hair net lol, it's actually for my shrimp nd snail tank and to make my day even better I just tested the PH and it's 8.8, I don't even know how it got that high all I had in it were 2 muscle shells and 2 small pieces of cuttlebone and last week when I tested it it was 7.4 so now I'm happy lol
I have also used the shower sponge things, like this, cut the center string, then cut the mesh to make it fit whatever I've needed. I've put java moss on a terracotta piece, then spread this over it and zip-tied the mesh underneath and the moss grew right through it. It is perfect! Just thought I'd throw this idea out there as well!