Fish dying one by one slowly

Hi everyone, new here!
Just was wondering if anyone has any ideas so why my electric yellows are slowing dying 1 by 1...
Water levels are perfect, temperature is about 25 Celsius, 2 sponge filters running
feeding them 2 types of food (which I feed my main tank are all fish are super healthy)
The only thing I have noticed is that they look kind of white and their fins don't look good?


Thanks in advanced!

Hi there! Sorry to hear about your fish...I don't know a great deal about this species but I do know that they need plenty of rocks and caves to hide in...your tank is very big and very open, so they may well be feeling super exposed and stressed

They need lots of caves and things to hide in. You say your parameters are perfect, what are they exactly?

These fish look stressed to me.

itiwhetu said:

These fish look stressed to me.

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I thought the same, with them all huddling in the corner like that...I'm not sure whether they should be brighter in colour as I'm not overly familiar with electric yellows but the clue's in the name...

They should look like this

Hi and welcome to the forum

Is this your first aquarium or have you had fish before?
How long has the tank been set up?
How long have you had the fish??
What is the ammonia, nitrite, nitrate, pH & GH of the water?
Are you adding Rift Lake salts to the tank?
Can we get some more pictures of the fish?

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The fish are looking really stressed out in the photo. This could be from lack of cover (hiding places), poor water quality, you standing there with a camera, or the tank lights have just been turned on.

You could try adding more hiding places like rocks, flower pots, plants.

TURNING TANK LIGHTS ON AND OFF
Stress from tank lights coming on when the room is dark can be an issue. Fish don't have eyelids and don't tolerate going from complete dark to bright light (or vice versa) instantly.

In the morning open the curtains or turn the room light on at least 30 minutes (or more) before turning the tank light on. This will reduce the stress on the fish and they won't go from a dark tank to a bright tank instantly.

At night turn the room light on and then turn the tank light off. Wait at least 30 minutes (or more) before turning the room light out. This allows the fish to settle down for the night instead of going from a brightly lit tank to complete darkness instantly.

Try to have the lights on at the same time each day. Use a timer if possible.

Hi everyone thank you so much for all the replies!

I think you people have found the problem, I went and bought some plants for them and some shelter and they seem a lot more happy already !
No more have passed and even a few of the ill looking ones are looking more healthy!
The tank does not have a light and has been set up for about 3 months, it has 2 sucker fish in it since the beginning and they have both been fine...
I have a 200 Litre Display tank in my living room, had it for about a year and haven't had one fish death(Pics attached), so that's why I got so stuck as to telling why they were dying...

Levels of water are as per photo,

thanks again guys

Awesome! Do a nice big water change now to get those nitrates down aim for 0-20, so you may have to do another water change again tomorrow to dilute things further. Fish are popping with colour now, lovely!

You have a Tropheus duboisi in the tank. They are pure vegetarians and will probably eat plants. Make sure you don't give it any meat foods or they swell up and die within a few days of eating meat. No frozen bloodworms either.

If you can get some Duckweed, it floats on the surface and grows quickly. It will help keep the nitrates down and provide the fish with some plants to snack on.

You need to get the nitrates down (as suggested by @CaptainBarnicles). High nitrates will kill cichlids and cause them to develop hole in the head and or head and lateral line disease.

You should do a 75% water change and gravel clean the substrate every day until the nitrate is close to 0ppm. Then do it once a week. Monitor the nitrates and if they go up above 20ppm during the week, do 2 x 75% water changes each week. If you can get some floating plants it will help keep nitrates down so maybe look into Duckweed or Water Sprite.

Colin_T said:

You have a Tropheus duboisi in the tank. They are pure vegetarians and will probably eat plants. Make sure you don't give it any meat foods or they swell up and die within a few days of eating meat. No frozen bloodworms either.

If you can get some Duckweed, it floats on the surface and grows quickly. It will help keep the nitrates down and provide the fish with some plants to snack on.

You need to get the nitrates down (as suggested by @CaptainBarnicles). High nitrates will kill cichlids and cause them to develop hole in the head and or head and lateral line disease.

You should do a 75% water change and gravel clean the substrate every day until the nitrate is close to 0ppm. Then do it once a week. Monitor the nitrates and if they go up above 20ppm during the week, do 2 x 75% water changes each week. If you can get some floating plants it will help keep nitrates down so maybe look into Duckweed or Water Sprite.

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Good advice as always, except for the duckweed...look into frogbit, water lettuce, or water sprite, instead, if you want floating plants

Duckweed grows like mad, and can get out of control very quickly, and can clog certain filters

The cichlids will eat the duckweed. The OP will probably have to grow it outside or in spare tanks so they have enough for the fish.

Will get into it ! Will start the water changes today thankyou everyone for your help !