Ok, your so good at this by the way haha! Just two more questions for you and then il leave you alone haha!
Do I keep feeding until I see the frogs eat.... Iv put more food in and that barb just isn't giving in, so I put some more in and the frogs are just crawling past speckles that have got to the bottom of the tank. 
Also my mum in law is giving me her fish tank, but she doesn't know how many litres it is, she knows the measurements, but it needs a new filter and I wanna get it right, I don't really know where to start