Found this small red (sea cucumber?) On the sandbed
For some extra context the grid its on is 1x1 cm its in a 200L aquarium with 4 seahorses, i dip all my coral but didn't dip my macro algae (also once a gorgonian with a small red tree sponge was added to the aquarium with out dipping because i wasn't home to receive it), the last time i added anything to my aquarium was atleast 3 months ago and nothing has died since (although mu flatworm issues has gone away?) Its about 2,5cm long (1inch) and it has a butt shape on both ends.
If its harmless id like to add it back to the tank but id like to know what it is
For some extra context the grid its on is 1x1 cm its in a 200L aquarium with 4 seahorses, i dip all my coral but didn't dip my macro algae (also once a gorgonian with a small red tree sponge was added to the aquarium with out dipping because i wasn't home to receive it), the last time i added anything to my aquarium was atleast 3 months ago and nothing has died since (although mu flatworm issues has gone away?) Its about 2,5cm long (1inch) and it has a butt shape on both ends.
If its harmless id like to add it back to the tank but id like to know what it is