Wow, thanks guys... didn't expect so much reply in a day. Thanks alot..heaps.
Just check, nitrite still zero. Bacteria cycle in this tank was working very hard after 3 weeks, hence most of the harmfull elements levels are very low... close to zero.
She is a XB... not a RTG... is there any diffrence? XB more sensitive? According to one of my local pet shop owners, XB are slighly more sensitve. They don't like bright environment too. Could that be the cause.
She swims around alot... but don't think she is nervous tho. She sometimes interact with us alot as we walk pass her. Not much human traffic to.
Been thinking of getting a bigger tank for her, but there isn't any more space in my house. Guess will have to look for a bigger house soon...Really wish I could house all my fishes in larger tanks. I have another Platinum Arowana that is kindda eating well. Its still pretty young for the moment but he is really eating...
Anyway... thank you again for all the advise given. Help very much appreciated. Will keep every body updated... will also share my platinum pic with everyone later... Cheers