So ive gotten 2 different bichir labled dinosour bichir from petsmart. They were healthly and swiming around... well they seemed healthy.. first one died in 2 days this second one died over night.... I just but sand in 3 weeks ago changed all the substrate out... my fis are fine... could i be goin through a mini cycle 3 weeks latter? Am I not cleaning the sand correctly?
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