That water conditioner should be fine. You can feed crickets and guppies but his main staple food should be earthworms/nightcrawlers (you will have to cut them to about the size of the distance between the frog's eyes) dusted with a high quality calcium/multivitamin powder. I like Repashy's Calcium Plus. Looks like you can order it here: http://www.aquaticsolutions.com.sg/
Ok thanks! The earthworms here In singapore are so skinny. Can I contact you thru somewhere else if I have more questions? [emoji13]