Invader

[Freenow54]

#reef squad I have some strange things appearing in my 30 year + tank that I have not had before. One is bristle worms . The other 2 or maybe 3 are a mystery . One I thought was Aiptasia. After buying Berghia and seeing no results to speak of ( 30 gallon / 5 berghia ) I took a closer look at photos on google . Now not very sure what they are ( the green flower topped plants. Then there is the white spots all over the Fiji Rock . Also I see white stringy like tails if you will which

are very visible in one photo. Any thoughts and non chemical treatment ? My Coral are suffering

 

[tbrown]

The "flowers" are hydroids it looks like.

What are your levels currently? Suffering corals in an older tank could be a lot of different things.

Do you do water changes or do you dose?

Any recent additions or changes?

 

[Fish Fan]

I don't know if your tag came through, so just to alert the others: #reefsquad

I agree with the hydroids, and that's about all I've got

 

[Freenow54]

The "flowers" are hydroids it looks like.

What are your levels currently? Suffering corals in an older tank could be a lot of different things.

Do you do water changes or do you dose?

Any recent additions or changes?

Calcium Buffer but that was after this . I do weekly 6 liter water changes

 

[Freenow54]

So what are Hydroids ?

 

[Fish Fan]

So what are Hydroids ?

This article may help:

Beginner Topic  Article 'Hydroids: A reference to some strategies'

Like many of us, I have had problems on and off over the years with Hydroids. The ones that have always given me the most problems are the common ones that almost look like a smaller and darker version of the beginner coral called Yellow Polyps. But the colonial Hydroid is much smaller than the...

• joe2
• Apr 5, 2021
• Updated Jan 9, 2026
• 4 min read
• Reaction score: 45
• Category: General Saltwater Aquarium

 

[jimk60]

I suggest you Google colonial hydroids and check images to identify. This was the worst hitchiker I've ever encountered and killed a bunch of corals before I shut down the whole tank. Don't wait to react like I did