Can anyone help with ID? I believe it’s dino. So far it’s only on the sandbed and disappears without light and at night. I did a 3 day dark period and knocked it back a little but it’s back fully now. It originally started at the end of a fallow period where my nitrates hit zero. My nitrates have been steady at 8 and phosphates 0.07 for a month now. Also been running 9W UV for 70 gallons. I just started another lights out period plus hydrogen peroxide twice daily. Also just got dr tims Dino tx of waste away and refresh I will be using when I get back from a short vacation. Below are the pics I got at max power for my cheap digital microscope. I have videos but can't seem to get them to upload. Is it amphidinium?