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Thanks for answering. I appreciate it. I realise I probably come across as not very animal loving, I am really, but I was honestly under the impression that it was only tropical fish that required filters, etc. As I say, we had goldfish for years, and they were literally just swimming around in a bowl.
Anyway, I do definitely need the filters in then.
Next question, and I know this is going to sound crazy, but having something electrical plugged in 24/7 which is in water, is there any way, shape or form that could possibly be dangerous/fire hazzard?