GHA (15 gallon tank)

hoopzers3

New Member
View Badges
Joined
Nov 13, 2025
Messages
13
Reaction score
7
Location
Florida
Rating - 0%
0   0   0
Hey guys, I'm currently battling some what I believe is GHA. This originated on a frag plug that I received from my LFS. was on the (Rainbow zoa you can see in this video) . I tried to contain it when I first started noticing it just around the zoa plug. I did the infamous (tooth brush) scrub the rock idea to try to get it all. Unfortunately as you can see its pretty much all over the tank and entire rock. Tank is about 7-8 months old now. So this didn't originate from my tank itself, but rather a hitchhiker.

I tried during my water change last week to get as much off the rocks as I could but it really is tough to get it all. I feel like I really cant get it all by the pinch and siphon method. Any recommendations? Is this a monitor and keep just trying to remove during weekly water changes? Phosphates are around the 0-0.03 range currently. so hopefully it will eventually starve the algae? I know product GHA removal is out there, but alot are against/some are for it. So not sure what to do. Any tips would be appreciated. Thank you!
 

Gumbies R Us

God, Bouldering, and Reefing
View Badges
Joined
Nov 10, 2022
Messages
28,944
Reaction score
51,298
Location
North Georgia
Rating - 0%
0   0   0
What does your CUC look like?
Manual removal is always something I reccomend
What are your nitrates?
 
OP
OP
hoopzers3

hoopzers3

New Member
View Badges
Joined
Nov 13, 2025
Messages
13
Reaction score
7
Location
Florida
Rating - 0%
0   0   0
What does your CUC look like?
Manual removal is always something I reccomend
What are your nitrates?
Nitrates in the 0-2 range. Sorry for the range. (Its hard reading the nitrate phosphate Salifert testers) lol

As far as CUC goes, this might be a problem is I have one Nassarius snail. So I am definitly lacking on that front.
 

dvgyfresh

5000 Club Member
View Badges
Joined
Jul 9, 2020
Messages
5,367
Reaction score
9,450
Location
US
Rating - 0%
0   0   0
That is a lot of algae , I would recommend more clean up crew and manual removal. If it becomes too much you may want to consider taking rocks out of tank and scrubbing in saltwater
 

dvgyfresh

5000 Club Member
View Badges
Joined
Jul 9, 2020
Messages
5,367
Reaction score
9,450
Location
US
Rating - 0%
0   0   0
As you can see I am also battling GHA, but I have 8-10 hermits , 2 urchin, 5-10 snails , 3 nassarius, and 1 conch in 20G
 

Attachments

  • IMG_3832.jpeg
    IMG_3832.jpeg
    306.7 KB · Views: 22
OP
OP
hoopzers3

hoopzers3

New Member
View Badges
Joined
Nov 13, 2025
Messages
13
Reaction score
7
Location
Florida
Rating - 0%
0   0   0
As you can see I am also battling GHA, but I have 8-10 hermits , 2 urchin, 5-10 snails , 3 nassarius, and 1 conch in 20G
Wow. Nice looking tank :D

Yeah I have heard that a Turbo snail may be good. for my 15 gallon i might pick up 1 or 2?
 

scoot

New Member
View Badges
Joined
Feb 17, 2026
Messages
16
Reaction score
25
Location
Wisconsin
Rating - 0%
0   0   0
Hey guys, I'm currently battling some what I believe is GHA. This originated on a frag plug that I received from my LFS. was on the (Rainbow zoa you can see in this video) . I tried to contain it when I first started noticing it just around the zoa plug. I did the infamous (tooth brush) scrub the rock idea to try to get it all. Unfortunately as you can see its pretty much all over the tank and entire rock. Tank is about 7-8 months old now. So this didn't originate from my tank itself, but rather a hitchhiker.

I tried during my water change last week to get as much off the rocks as I could but it really is tough to get it all. I feel like I really cant get it all by the pinch and siphon method. Any recommendations? Is this a monitor and keep just trying to remove during weekly water changes? Phosphates are around the 0-0.03 range currently. so hopefully it will eventually starve the algae? I know product GHA removal is out there, but alot are against/some are for it. So not sure what to do. Any tips would be appreciated. Thank you!
I also have a 15 gallon and just went through a gha phase that almost got to this level. I was scrubbing it weekly and doing stuff like rinsing frozen food and being really careful not to overfeed so that phosphates would stay low, these steps helped a bit but it was still growing pretty crazy.

Idk what your cleanup crew is but what ended up working for me was i got 5 new astrea snails (og cleanup crew was too omnivore heavy - hermits and nassarius), brushed all gha as much as possible right before adding them, and made sure that they are always on the rockwork. Literally just counting all 5 whenever i am near the tank and if any fell or were on the glass pulling them off and putting them on the rocks wherever i feel like they are needed most. This was only about two weeks ago that i added them and now my gha problem is probably 95% resolved so they have been quite fast.

I assume you are using RODI water with 0 tds? If not this can contribute to algae growth.
 

dvgyfresh

5000 Club Member
View Badges
Joined
Jul 9, 2020
Messages
5,367
Reaction score
9,450
Location
US
Rating - 0%
0   0   0
Wow. Nice looking tank :D

Yeah I have heard that a Turbo snail may be good. for my 15 gallon i might pick up 1 or 2?
Thanks I love anemones if you couldn’t tell lol
I had 3 turbos as well so great additions , my hermits wanted their shells however
 

Mr. Mojo Rising

10K Club member
View Badges
Joined
Feb 14, 2021
Messages
13,336
Reaction score
15,812
Location
Toronto
Rating - 0%
0   0   0
More snails and algae grazers will help as mentioned, IMO the tank needs more flow, there's very little movement on the bottom half of the tank.

The most common reason for bad gha is excessive nutrients in the system. Does your filtration system export any nutrients? More water changes and manual removal during water changes

IMO there is no point is testing nitrate/phosphate, most of it is absorbed by the algae so it won't show the true level
 

TOP 10 Trending Threads

WHAT AMOUNT OF LIVE ROCK AND SAND SHOULD BE PRIORITIZED FOR OPTIMAL BIODIVERSITY/FILTRATION?

  • 100% live rock + bagged sand

    Votes: 34 28.1%
  • 100% dry rock + 100% live sand

    Votes: 41 33.9%
  • 50/50 live/dry rock, 50/50 live/bagged sand

    Votes: 27 22.3%
  • 75% live rock, 25% live sand

    Votes: 11 9.1%
  • 25% live rock, 75% live sand

    Votes: 8 6.6%
Back
Top