Sorry for being longwinded. When our DS was 3 weeks old, and would not settle we found the colours of the fish at the pet shop calmed him, so we got 3 goldfish. I have increased the size of the tank over time, we moved house and emigrated and brought the fish, all over a 10 year period. We lost one goldfish through emigrating, so was down to 2. Then a couple of years ago we lost another at 8 years old. We were left with one in a 120 litre tank, and managed to find a single goldfish to add so it wasn't lonely.
Last week we lost the last one of the original 3 at 10 years old. My son is absolutely heartbroken! For background there is a lot going on right now with our special needs daughter and our son's fishtank is really his only 'own thing' and I really want to add to the tank rather than making him give up the newer fish.
The tank is 120 litres, has a good filter and pump and temp is set to 22 degrees, I'd rather not add another goldfish (I appreciate they are meant to be in a pond) is there anything I can add to the tank to keep the fish company?