What are these little spore-like… things?

[zHaworthia]

They are everywhere and I’m hoping they aren’t a threat or anything to the tank. Just a 15 gallon with a betta and 3 nerite snails.
Read that they may be Hydra but I am not 100% sure as they’re green and not white. I would just like them gone.

 

[Rocky998]

Maybe an algae forming?

 

[zHaworthia]

I'm not sure what kind it would be. It's becoming a hair-like cloud on the java moss I have as well as sticking to my anubias

 

[Oblio]

Sketchipedia to the rescue

Hydra viridissima - Wikipedia

en.wikipedia.org

 

[Rocky998]

Sketchipedia to the rescue

Hydra viridissima - Wikipedia

en.wikipedia.org

Only reason I dislike wiki is because most anyone can edit it...

 

[Rocky998]

Only reason I dislike wiki is because most anyone can edit it...

If they wanted to, it could say: ghgkgheruhc95t7gnfgksfdhgsifggnjsdfg

 

[zHaworthia]

I think this might be it! Thank you! Now my attempt to obliterate them comes.

 

[Oblio]

It did mention that they prey on small crustaceans, but someone here with experience will give the accurate response as to risk and eradication recommendations.

 

[Naughts]

Yes, hydra. They are probably green from feeding on algae. Eradicate with aquarium salt. 1 tablespoon for 20 litres (5 gallons). Leave in for two weeks. When you do a water change add back the salt that has been removed.

 

[zHaworthia]

Yes, hydra. They are probably green from feeding on algae. Eradicate with aquarium salt. 1 tablespoon for 20 litres (5 gallons). Leave in for two weeks. When you do a water change add back the salt that has been removed.

So adding 3 tablespoons of salt (15-gallon tank) won't harm any plants or the 3 nerites or betta in there?

 

[Duckquarium]

So adding 3 tablespoons of salt (15-gallon tank) won't harm any plants or the 3 nerites or betta in there?

Just move them before you do it

 

[Naughts]

So adding 3 tablespoons of salt (15-gallon tank) won't harm any plants or the 3 nerites or betta in there?

No, that dosage is safe. I have only ever had adverse effects with aquarium salt on floating plants so you may want to put some of those elsewhere (another tank? A clean vase/ bowl on windowsill?).
I use the API brand aquarium salt.

 

[Colin_T]

@Naughts got it right, Hydra that have been feeding on algae

 

[denogginizer]

Use at your own risk, but this worked for me in a tank with only CPDs: https://www.aquariumadvice.com/forums/f12/step-by-step-how-to-kill-planaria-and-hydra-231872.html

Unfortunately, I must be doing something wrong, because they keep coming back.