HI guys, hope I've put this in the right place. If not, someone feel free to move it to somewhere more suitable.

So, getting ready to get some tadpoles for my daughter and trying to sort out the final details of the equipment i'll need. Planning to get 1 or 2 Southern Bell or Green and Golden Bell frogs. I have a glass fish tank that is 30 cm x 30 x 61 long. I have to make a screened lid for it yet. Anyone got any ideas on how to keep cats out, but let the air in?

I had bought an undergravel filter, but after seeing some very scary xray photos (on here!) of frog swallowing gravel I'm thinking that I'll take it back (the shop is willing to change anything). They also had a tall filter that had a grill intake at the bottom, and the water comes out the top. I didn't get that originally because I thought the water dropping might disturb the frogs. Would that be a better choice?

That's about it for now, loving this site. so much information that I think I'm getting a handle on, I just want to be sure I've got things right before we actually get our tadpoles!
Cheers!