You can use a few hardier fish to do this for you, but you will expose them to a lot of ammonia and likely kill them. Your toddler may find issues with this method. Fishless cycling is more humane but requires a lot of waiting before you can add shiny fish.
In short, I think Russ's suggestion is the one to go with.
Next up, get two solid state drives
A RAID clutch assembly? I like it. Tricky would be impressed.
Haven't posted on here for a good six months, or in its current form. Had about 100 pages of mundane moments to catch up on. Decided to skip them all and just post this instead.
As Mr Fox from Peppa Pig would say - A good choice.