Cloudy eyes + dark iris + not eating for 1 week

Noticed that RTG pupil surrounding seems abit 'translucent' this morning before work.
Just got back and seems like it had developed into slightly cloudy eye symptom.

Last night noticed that aro seems easily frightened, like when i approach it, it would suddenly turn or dart quickly, once it almost jumped.

About 2 weeks back when my tank was affected by high nitrites (http://www.arofanatics.com.sg/forums....php?t=313703), noticed aro's iris seems to be getting abit dark colouration. it changed from the usual greenish/golden colour to now slightly brownish colour. It stopped eating few days later.

Till now its about 1 week+ since it last ate. Although previously during low ph6.5 and high ammonia, its still eating, but now with better water parameters but higher ph, its not eating.

My 522 80%-filled tank has just completed cycling few days ago and yesterday's water parameter as follows:
ph 7.6
ammonia 0mg/l
nitrite NO2 0mg/l
nitrate NO3 25mg/l

Questions:
1) Should i remove the 1kg zeolites (been in tank around 1 month during high ammonia phase) and replace it?
2) Should i lower the ph as the rtg seems to be more comfortable with around slightly less than ph7.
3) My usual practice is to wc at least once per week, I intend to wc 20% tomorrow with ~30L of aged water + some tap water. Is there anything i should take note of?
4) I'm leaving sg for 5 days next week. What should i do to prepare in these few day as there would not be anyone to help me with wc.

Any advice from bros and sis greatly appreciated..