My guppies are all Hanging out in a corner

[Kitchy]

I have a 20 gallon tank for 2 years now and my guppies have started to stay in a corner all together and not moving much, I have an airstone and the filter is normal.
They don’t even move when I give them some flakes, before this happened they were always crazy whenever I gave them food, now they just stay in the corner.
I don’t know what is going on, can someone help me?

 

[coralbandit]

What is your maintenance schedule?
How often and how much water do you change?
Have you added anything new lately ?

 

[Kitchy]

What is your maintenance schedule?
How often and how much water do you change?
Have you added anything new lately ?

I do a 20% weekly waterchange, I clean the filter sponge once a month(with aquarium water), I recently got a Betta in my tank but he is doing fine, only the guppies stay in the corner

 

[coralbandit]

He may be intimidating them [or more ]..Bettas are known guppy harrassers ..
They are jealous of other flashy colored long fin fish..
NO JOKE!

 

[Kitchy]

What is your maintenance schedule?
How often and how much water do you change?
Have you added anything new lately ?

I just got a good look at them and the Females have a black spot near the "belly area, is this some king of sickness?

 

[coralbandit]

Look up 'gravid spot'.
It is likely your gups are just pregnant?
'Black spot' disease is very uncommon....

 

[Kitchy]

Look up 'gravid spot'.
It is likely your gups are just pregnant?
'Black spot' disease is very uncommon....

I think I would know if they were just pregnant, it's not in that part of the belly its closer to the head but still in the middle of the fish and is a pretty big spot, if it would just be a normal pregnancy, why would the males go to the surface too?

 

[Kitchy]

He may be intimidating them [or more ]..Bettas are known guppy harrassers ..
They are jealous of other flashy colored long fin fish..
NO JOKE!

I have him for almost 3 weeks and he has been pretty tame, anyways I will keep an eye on him.

 

[Kitchy]

Four guppies have died and the others seem really weak...
What should I do? ;_;

 

[TMaier]

Seems pretty obvious that adding the Betta has totally stressed the guppies even if you aren’t witnessing any action on the Betta’s part. I suggest removing the Betta and a 50% water change and clean the filter sponges.

 

[Kitchy]

Seems pretty obvious that adding the Betta has totally stressed the guppies even if you aren’t witnessing any action on the Betta’s part. I suggest removing the Betta and a 50% water change and clean the filter sponges.

Okay, I'll try doing that, thanks

 

[Kitchy]

All of the fish in my tank are DEAD, all of them!!!
How is this possible???

 

[coralbandit]

Can you post pics of any of the dead with the black spots..
Can you test your water?
Just hanging at the surface could have indicated a water issue. A test today can confirm or rule out water?
Sorry about your fish...

 

[TMaier]

So sorry. Some water problems or illnesses can kill very quickly. I lost a whole tank full of shrimp due to heavy metals.

 

[Kitchy]

Can you post pics of any of the dead with the black spots..
Can you test your water?
Just hanging at the surface could have indicated a water issue. A test today can confirm or rule out water?
Sorry about your fish...

Too late for photos, and the water is completely fine.
The only thing I noticed that could have killed them was the ph, it was a little bit higher than usual, but not enouth to kill them (I think).

 

[Kitchy]

So sorry. Some water problems or illnesses can kill very quickly. I lost a whole tank full of shrimp due to heavy metals.

Thanks for your help anyways, now I have to think of what to do with the tank...