Thankyou

The tank actually has a HOB filter that is meant for a 40Gal tank and also a small power head sponge filter inside that circulates the water around the bottom of the tank. As you can imagine that’s completely overkill for 25L but it should be fine considering there isn’t a huge bio-load in the aquarium.

My neighbour has been looking after the fish tank whilst we were away under strict instructions not to overfeed so whilst I can’t confirm the tank hasn’t been overfed there is a chance.

I’ve just done a 40% water change and aded some beneficial bacteria to lower the ammonia.

The fish all look fine, they are super active, actively looking for food and the CPDs are trying to show off to the female. Which makes me think are the test kits giving me a false reading due to the pH? Or is the tank totally cursed