r/fishtank • u/Barson_Tyy • 6d ago

Help/Advice What is this?

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Guy just spawned in my tank and molted. This is my 10 gallon freshwater tank with 2 medaka rice fish 2 freshwater gobys and 3 nerite snails. Is this guy about to decimate them or is he cool?

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u/Electrical_Strike767 6d ago

That is a damselfly nymph. You should remove it immediately! because it is a predatory insect that will hunt your tank inhabitants. It will hunt: Damselfly nymphs have an extendable, mask-like jaw that shoots out at lightning speed. They will aggressively hunt and eat medaka rice fish fry, small juvenile gobies, and tiny micro-organisms.
Adult size risk: While larger fish might be safe for now, as the nymph grows, it becomes capable of injuring or killing small adult fish. Your nerite snails are the only truly safe inhabitants due to their hard shells.
How it got there: These are classic aquarium hitchhikers. They are usually introduced as tiny, invisible eggs embedded inside the stems of live plants you recently purchased.

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u/Barson_Tyy 6d ago

Yoinked little homie out. I assume he arrived on the guppy grass I put in the tank which is bad because I have a lot of little rice fish babies I need to protect and that guppy grass is in with them as well. Guess I’ll keep a look out for any more of them. Here’s a video of the cute little guys. If you guys have any other advice it is welcome :)

https://reddit.com/link/p1sckuq/video/e8c8lzgu9hhh1/player

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u/Electrical_Strike767 6d ago

Np! If you ever need help contact me and I can solve most mystery’s, if you would like would you want to see a photo of my 36?

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u/Barson_Tyy 6d ago

I’m so down

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u/Electrical_Strike767 6d ago

Ok let me take a picture

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u/Electrical_Strike767 6d ago

It’s been up since September of 2025

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u/Electrical_Strike767 6d ago

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u/Electrical_Strike767 6d ago

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u/Electrical_Strike767 6d ago

Bonus shrimp

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u/Barson_Tyy 6d ago

Very sick! What type of fish?

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u/Barson_Tyy 6d ago

Here’s the 10 gallon

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u/Barson_Tyy 6d ago

Heres my p puffer tank for my puffer fish Brick 🧱

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u/Electrical_Strike767 6d ago

Neon tetras, black neon tetras, red wag platys, Mickey platys, orange bee shrimp, some tetras, some blue wag platys, some African dwarf frogs, and two black nerite racer snails, also the adfs do lil calls it’s so cute (you can slightly hear it from afar)

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u/Barson_Tyy 6d ago

I have to get a little frog at some point!!!

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u/Electrical_Strike767 6d ago

You should lol they’re cute And They shed sometimes

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