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Please help identifying this plant growing on my live rock. It has taken over the whole one corner in my tank.

Could you please help me identify the attached copepod. Woke up this morning and the aquarium glass was covered in them. No signs of them on my fish (Striated Tang, Box Fish, Flame Angel). Currently approximately 3 mm in length, two long tentacles and between 12 and 14 legs and...

Urgent help needed to identify disease in my marine tank. It has already killed my powder blue tang, a damsel and now a clown. I have been treating my tank for ich with Cupramine but this does not look like ich. It causes grey patches (see image) and eventually fish start swimming erratically.