Hi, I am new to tropical fish keeping and “thought” that my local pet shop would give me some advice. I have a 14G tank and 2 male dwarf gourami (the pet shop didn’t tell me it was a bad idea). One of them was bullying the other one so I tried to break it up by putting 6 x black neon tetras in with them. It’s calmed them down but the fish that was being bullied is still behaving strangely just floating around. I noticed that he had started to turn grey and now he’s building bubble nests all over the tank. Does this mean he is happy and I am just worrying over nothing or can they still build bubble nests even when they are stressed? Thank you