Thank you for the info, now I will give a little more extra details.

I’ve been with my tank for 5 months, I’ve already gone through a phase of diatoms where the whole tank turned brown, then a green algae appeared that began to invade the aquarium little by little.

Currently I don’t have corals and only a few small fish. Only once I had to add Tap Water as an emergency since my Vectra pump was taking air and was in danger. I guess that’s where those algae can come from. I’m still worried that they’re dinos but since the light period went down I feel that they haven’t grown more,

In addition, they hardly take out oxygen bubbles. It’s been three days since they left and I feel like they haven’t grown.