Hi everyone I just wanted to find out why my corydoras May have died suddenly. I’m from Aus btw. They seemed pretty healthy I’ve had them since October last year and I have a 60L tank with 8 neon tetras, 2 gouramis and had 4 corydoras (now 2). They all seemed pretty happy but my tank started getting a lot of algae so I ended up buying two sucking catfish. I’m not sure if the sucking catfish killed my corydoras or if maybe I didn’t give them enough food to survive after I got the sucking catfish. The PH level is usually at 7-7.5 and I change about 1 third of the tank water every one or two weeks. I don’t know where I went wrong I hadn’t had a fish die on me so I feel pretty disappointed in myself. If anyone can give me some advice would be much appreciated.