Harlequin Rasbora Stress/disease

pjeterschornstein

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Hey all!

I'm new to this forum and it's my first post.
I had 6 Rasboras as a part of an aquaponics system project for more then half a year located at a friends house. I moved it to a my place about two month a go since they didn't have much time.
The move was stressful for the fish as far as I can tell. I also had a problem of hard water and high PH which I had to deal with. It had no lights and after adding some lights there was a brown algae problem.
It looked like there is major bullying problem: one or two of them were keep chasing and harassing everyone but one in particular and he started loosing color.
A second one also lost a little color a bit and looked like he got bitten in his tail and a third that lost a bit color too.
It didn't have large plants before and I added a large sword plant, stones, driftwood and duckweed to change the setting and give them more hiding places but it didn't help and I noticed they raising their back fin and fight sometimes.
I used to feed them fruit flies so I switched back to flacks to see maybe it's diet related.

I got 3 more Rasboras to try to change the pecking order and now they seem pretty peaceful and I thought it'll go back to normal now. last week the first one starting having red around eyes and gills and then the second. yesterday I took a lot of the duckweed out and I looked from above and noticed the second one is really fat and his scales looks shabby. He and the other one lost all color and most of the black triangle. He dons go for air or behave differently but today noticed he's moving his mouth much more then the others and in the last hour looks like he's hiding and reclusive.
Apart from that they are acting pretty normal now and some of the healthy ones even practicing matting under the leafs. I'm really lost at what could I do and thought I best ask here.
I am writing 'he' all the time but it's hard for me to recognize if it's male or female.

55 liter aquarium 9 Rasboras, two Ramhorn snails. well aerated (Cyclone bucket 15min every hour), 8h on light.
Ammonia 10, Ammonium 0, Chlor 0, PH 7.6, KH 10, GH>14, NO2 0, NO3 0, temp 24 Celsius

I'm adding a pic of the system, the settings, the first pale thin fish with red around his eyes and second pale with fat stomach and (I think) a bitten tail.
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pjeterschornstein

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Update:
Yesterday one of them (the fat one) started hiding behind a leaf all day today the other one too. They are just hiding now and not swimming much.
I fed them some peas today thinking it might be constipation problem. they didn't came to eat but after a while I tried feeding them with tweezers and they eat a bit.
Anybody know what could it be/ what to do? I really don't want the whole aquarium to get sick and I want to help them...

2nd update: Found the fat one with bitten tail dead on the floor funny he look better dead and got he's color back.
The other two are also putting themselves apart from the group :/ I'll give it a week and maybe do some marcy kill so they won't suffer too much..
 
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