Hi Annewiggy
It was all a learning curve with Archibald & Horace. What did help us in those early days, was housing the goldfish in a huge glass tank. My dad got hold of a battery glass tank. Maybe one of our heritage motor enthusiasts can help, but in early motors, so as to stop battery acid leakage, the batteries in posh motors were placed in these glass tanks.
It was a one-piece moulded glass tank, so no joins to leak. We had only had it a short time when a pump driven bubbler was added, which meant that the water would stay fresh for ages. Happy times.
Forgot to mention that a comical sight was when the budgie used to bathe in it & nearly drown. That is when we had to add a top to it.