First of all, nice sized tank you got there. Consider an arowana planted tank. See my old one.
But, I have the following advice:
1. Big tanks require a fair bit of work. Can you spare a few hours every week or two? Changing a quarter of the water alone can take close to an hour, depending on the flow rate in your house.
2. Big bills... water and especially electricity, due to the number of filters/pumps and amount of lights you will need to run on them.
3. 80 cm tal and 60cm wide tank... very hard to maintain as it's hard to reach the bottom of the tank. And i'm talking about the front only. It'll be very hard to reach the middle of the tank. If the back of the tank is against the wall, good luck reaching the back of the tank. My biggest problem with the 60cm tall and 60cm wide tank was that I cannot reach the back of the tank with my hands while looking thru the front glass. Usually you need to look through the front glass to see what you are doing. The water surface will be rippled by your arm movements and you will see nuts.
4. Make sure the lights can be individually controlled. Else you will be tanning your back under the MH (or whatever light) while bending over the tank, or working in the dark. With individual control, you can turn on adjacent lights and keep the ones on your back off. Besides, you'll be blocking it anyway and the hard shadow will hamper you too.
5. Deeper tanks need more light. The deeper it goes, the harder for light to penetrate. Bigger bills, and less choices of low growing plants.
6. Flexibility... you might not need the brightest lights for the whole tank. If you design your tank scape first (i.e. focal point, where the light-needy plants are, etc), you can decide which are will need the brightest lights. the rest can be low or moderately lighted.
7. Big tanks like this do not use the 3WPG rule. That rule does not scale to very big tanks nor very small tanks well. I think a safe bet is 150W of MH per 60cm run. Which works out to about 6 3 MH in your case. Get the ID to get home lighting ones (i.e. not specialised aquarium lights). Those are much cheaper. Build them into the upper cabinets... remember to ask ID to consider ventilation. These things run HOT.
All in all, it's an expensive endeavour... the initial set up and the monthly bill. Don't forget about gravel, fish, plants, etc. With MH, you might want to consider a chiller... a large one... then ventilation and placement of the chiller is anther issue to consider.
IDs love to do these HUGE tanks, but very few have the experience to tell you what you're in for and what you need to consider. Many will tell you, can lah, or can do this lah, can do that lah... but seriously, YOU are going to live with it, You are the one whose gong to setup and maintain the tank, not them.
There are much more to consider. I'll be more then happy to chat with you about it (I'll PM or email you) and there a few other members who will gladly share their experiences with you.
I'm not wanting to discourage you (I would love a chance at such a large tank again), just that you need to start it right and know what you'll be facing, else you're gonna face a fair bit of problems later. Frankly, I would love to see you succeed.
I can tell you though... large tanks are more stable "ecologically".
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