30x30x45 in cm are way too small for 2 frogs, especially if one is a female ( the bigger one I'm assuming, but i don't see it's head from a side so can't say for sure. for these two you want at least 45x45x60 cm tank. i meant at least! the bigger the better.

UVB is a must! 5.0 for smallish enclosure ( say 18x18x24 in inches or 45x45x60 in cm) for 12 hours a day! use it as a day lamp + basking spot lamp. in a hot spot temps have to be at about 91. even in sunny positions there is no enough of UVB is getting in through the glass.

didn't quite get what type of water you're using? would you please clarify.

3 walls of the enclosure have to be covered, your tank is too open.

last feeding - i hope you meant june 29 of this year, is it right?

vitamins you need to give once a week , not month, calcium every second feeding.

pictures of the frog - are these recent? i can't see what is it on it's skin? water drops?

i want you to do following first:
-cover 3 sides first, put some kind of plant on one of the sides as well
- turn on your UVB for 12 h a day
- put the bigger frog on a perch under the UVB lamp.
- take pics and post them here. i need pic of it's head sideways, pic from front so the belly and face is visible. if pics you posted are not recent, i need then pic from the top as well.

please do that and update on what is happening tomorrow and we'll go from there.