Might help if you could take some close up pictures of them, maybe someone will recognize them. Should also post about this in the disease and parasite section if you havent already, this doesnt sound like something specific to stingray tanks.
knifegill;4814418; said:Sounds like gammarus, scuds. Try adding something that will eat them all and can avoid predation. Perhaps a trio of giant danios.
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Tor-Eriik;4815008; said:What is your WC schedule? Bugs like that appear when there is alot of minerals in water and substrate..Ive had some bugs in my tanks, and it simply came by overfeeding and to small waterchanges.