I was peering into my seahorse tank, which contains seahorses and plastic plants, bare bottom and sponge filter. It has been set up for about a year. I feed it only BBS daily. Anyway today I noticed loads of these creatures, they look like mini jellyfish swimming, biggest is about 5mm. They are clear but do a fine job of devouring BBS. There seem to be hundreds, and I can only assume they came on the BBS eggs. When I put one on the slide (actually 2) they take on a square shape but you can faintly see the circular cowl over it. The big orange bits in the corners are BBS they captured. Any ideas? Next question can the killies eat them? Thanks Lorraine
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