BulkRate;1105888 wrote: Little tip - you may want to go by a brewer's supply store and replace those cut/drilled metal lids with rubber/silicone stoppers. Over time they'll rust out and potentially contaminate your culture or at least turn seriously gross after about 3-4 months.
Learned about this the hard way when my coworker and I attempted to build DIY red volcano shrimp "ecospheres" (read - off-the-shelf unsealed room-temp pico vases)... almost all of his shrimp died in the first 72 hours, all of mine plus one Bruce Willis-style last-man-standing survivor from his are still trucking after over 3 years. Only difference was the drilled sheet metal lid (his) versus acrylic lid (mine).