hmmmm, what are these interesting things

FuzzAz

They look like a sea anemone... sorta. freshwater btw

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onefish2fish

hydra?

what kind of fish is that?

FuzzAz

I just read the article on Hydra from Wikipedia, I would say that is them. Amazing.

That is a Yoyo loach

onefish2fish

they are interesting huh, i can prob. almost gaurentee they hitched in on a plant

SinCrisis

are hydra good or bad for the aquarium?

Lupin

That's debatable. There are allegations that it is a sign of good water quality and also poor water quality but they will not harm anything except shrimp larva and most snail hatchlings. If you hate them, get the Asolene spixi. Be careful not to get the hybrid which has the genes of Marisa cornuarietis as hybrids are voracious plant eaters. If you can get them within your state, this is the only legal way as spixis have been banned from interstate shipping after the USDA discovered they can crossbreed with the plant eating Marisa cornuarietis.

daisycutter

nice closeup photos, hydras can eat fish fry im supriesed the loach hasnt eaten them ive had hydras before and fish tend to eat them

Lupin

I forgot the loach. I guess the snails aren't an option with a loach there.

FuzzAz

I did have pond type snails, thats kinda why I moved the loach into this tank. A week ago there was a bunch of sanil eggs where the hydra are now. Also there were lots of copepods.

fish_4_all

Lots of copepods = lots of hydra. It will cycle back and forth for as long as you leave them alone. I see it happen about 4-5 times a year. I love to see them eat the copepods. Look really funny with their fat bellies. Once the pods vanish or the numbers are severly depleted the hydra will slowly vanish until the next outbreak.

I have never had a problem with them keeping for cory and guppy fry. The typical species you see is too small to eat most fry. Note I said most as some fry are extremely small and can be eaten by them.