hi everyone! i would realy like a soft water fish for my sons 54litre fishtank ill be receiving soon. Something that will realy grab his attention hes only 18months old. It will have 5 peppered corys in it so soft water fish only. I have also ordered all of the spongebob aquarium ornaments for him including spongebobs pineapple house and squidwards house.It will be planted with a white sand substrate and driftwood. Any suggestions on the perfect fish to add to my sons tank would be great! ( and suitable for a 54litre)