from a quick glance the fish look very healthy and the tank looks rearly clean, but not under any circumstances should that cat be in a size tank like that.
im wondering if they have always been in that tank TBH. Look at the main pic, it looks like the tank has just been placed in that room for the photo. Theres no flooring down either. They may have been kept in other tanks that the seller has already sold but they people didnt want the fish.
Nevertheless, great looking fish, but not being kept correctly at the moment.
I thought no way when I first saw the title of the thread, but then I looked at the pictures and wow, that is way too crowded. They are such beautiful fish too.