I´m sorry to say that those conditions are terribly inadequate for your newts. A pair of these will require a minimum of 10 gallons of water for apropriate thermal and chemical stability. also, gravel is an impaction hazard and it traps huge amounts of debris and uneaten foods, making the maintenance of adequate water conditions very difficult. With such a deep layer of gravel, there are further problems asin the deepest parts oxygen levels may be starved and anaerobic conditions could produce toxic compounds.
The newt trying to climb the sides is a good indication that water conditions arelikely to be inhospitable.
Make sure to read this article, and i would recommend all the other CC articles too:
Caudata Culture Species Entry - Cynops orientalis - Chinese firebelly
You will require a larger container that can house a minimum of 10 gallons of water (more is even beter) and you´ll have to cycle the tank apropriately.
I cannot stress this enough, your animals as new purchases are severely stressed and vulnerable because their inmune systems are inhibited (the importation process from China takes a huge toll), so in order for them to recover from the ordeal they´ve gone through, they will need optimal conditions. You need to get properly informed and learn how to provide those conditions ASAP. Otherwise, the likelihood of developing infections or other problems is really high (it may happen regardless, but if their inmune systems are allowed to recover, the chances are better).
In terms of food, bloodworms are fine as part of a varied diet but make sure to remove uneaten bits. You should get your hands on some earthworms as those are the ideal staple. To add variation you can occasionally offer the bloodworms, waxworms, isopods, blancworms, whiteworms, small crickets, adequate, caudate-formulated pellets, etc...