Only one type of red - Super Red which is then subcategories to Blood Red and Chili Red. Everything else is branding. No beginner type. Reds require patience, genetics and skill as well as some luck. No such thing as cheap and good. You pay for the quality.

The Xian Long tanning light works well albeit its soft tanning. Its fine at a year old but do take your time and start with a few hours a day gradually increasing in the span of weeks. Every individual fish reacts differently so observation is key. If the fish stops eating, it's normal behaviour.

What is your arowana size? Try add on some tankmates, and cover up blue or white ( for 5inch - 14inch arowana ) for both side ( left and right glass )

Based on my understanding...

top filter or canister
No degassing, means oxygen exchange solely rely form saturated o2 available from your tank water. Requires aerator to promote aerobic bacteria growth and fish well being. When O2 not sufficient bacteria colony may got wipe out... hence the cloudy water syndrome when ever fresh tap water are introduce to tank during water change, sick fish, not to forget a acid generator if pre-filter are not clean periodically. 

Trickle filter.
Provide some form of degassing, C02 are strip when water drip on medias, however it's subject to how the trickle box are design. If it's fully enclose then back to square one, a CO2 reactor. A properly design trickle box require a lot of ventilation. Another concept can be put to use is to have a fan sucking air out from bottom to top for promoting active O2 exchange, such type is known as counter air flow trickle.  It introduce load of O2 on water which is beneficial to fish and bacteria colony. (I'm building one for my upcoming tank )

Old school sump, pretty much similar to top filter / canister if it's enclosed inside cabinet.  The advantage is,
1) Space for load of peripherals, such as UV-C light, heater and etc.
2) Able to accommodate load of medias
3) Spot with very slow water flow or dead spot for anaerobic bacteria growth to keep nitrate in check.

U mean to say u would have to move your old tank and then install the new one and the fish will be temporary displaced?

Here is an idea. If you are in good terms with a LFS, they may temporary house the Aro for you while you cycle the tank. There is no hard and fast rule cycling new tanks. If you can get the bacteria culture up and running it could take 2 weeks maybe more. Take your used media out of what ever filter you are using and introduce it as seed to hasten the cycle. The key is to keep testing the chemistry of the tank till you get a low and constant reading. If the Aro is the only occupant, there will be less “stress” on the new tank.

Can be done. Usually the fuys will bring a holding tank ans transfer your fishes then setup the new tank with existing media so you wont have any issues with nitrogen cycle. Ones done they will transfer back. All done in matter or few hours.