To start off, I don't have FBT, but I have made a 70/30 tank before with things I already have.
You can find river rocks at lowes or home dept (the ones they put into decrative ponds that are smooth and about the size of your thumb) on the entire bottom of the tank. Find some large rocks to make a shore line, the thought is to hold back the land.
Land portion: Fill with more rocks of your choice up to the top of desired water line. Place sphagnum moss (make sure it is frog friendly) into some treated water and soak. Squeeze excess water from the moss and lay over the desired land area. Then top moss with either eco earth or other type of frog friendly soil. Plant real plants (will need some light) or use fake plants. Add decorative rocks or if your daughter is like mine something cute, decrotive, and frog friendly.
If you are going to use a filter...I have a little one (filters I think 10-15 gallons) I purchased at walmart that has suction cups on the back and just sits in the corner of my 70/30 tank. It has very small intake holes and a waterfall (more like dribbles) over the top of clean water. To keep the inhabitants of this tank stay away I place larger rocks around the intake, to keep them away, but I don't block the flow either.
Does this make sense? I'm sorry I am trying to type in a hurry, but wanted to offer my help. I'm new here too and welcome!!!





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