Multiple filters may not be necessary, It depends on how strong the first one is. You can always run the hoses to either end, either inside or outside.
Depends on your layout too. Are you going to have a triangular layout? high on one end and slope down to the other? Or a valley layout? Or mound layout? It will affect you hide the filter plumbing and other equipment.
For my own 6ft tank, I split the filter output into 2, one at each end.
Of course running long hoses will effect the flow rate somewhat. And also the aesthetics and ease of maintainance factor.
For point 2, I meant reach by hand not the light... for maintainance and planting. Light reach issues can always be resolved by using less light demanding plants at the foreground. With a tall tank, you'll find it harder to maintain foreground anyway, so you'll want something that won't grow too fast... like some short cryptos or moss.
Get a short ladder or sturdy stool for maintainance purposes.
For such a large tank, most ppl will aim for more low maintainance plants like rossettes and less fast growing stemmed plants.
For pt 3, say for tank like this:
Code:
+---+---------------------+---+
| | | |
| A | Tank | A |
| | | |
| | | |
| | | |
| +---------------------+ |
| +----+----+ +----+----+ |
| | | | | | | |
| | | | | | | |
| | | | | | | |
| +----+----+ +----+----+ |
+-----------------------------+
The two sections marked A are part of the cabinet. The filters and electrical connections will be inside the cabinet at the bottom portion. The wires and hoses will have to be run through the insides of sections A to reach the tank top. Sometimes the A sections are made too narrow, or the access holes are too small and it becomes very difficult to run the hoses and wires. Don't forget the hoses have to removed occassionally for cleaning. The best is to have the A sections made with removable panels or doors so that you get better access into them.
As for load bearing... HDB flat owners have to get a permit from HDB before installing tanks larger then 4ft. I haven't done the application before, but my impression is that it's not impossible to get. HDB simply wants to be satisfied that you will install a sufficiently strong frame to hold up the tank and spread the load (as oppose to the skinny 4 or 6 legged iron stands commonly sold) and that the tank is placed in a strong load bearing portion of the flat (usually near or on a support beam/wall/structure).
One guy got thru the application with 2 rectangular steel frames... one to hold the tank, and the other to rest on the floor, and 10 legs between the 2 frames. The cabinet was built around the frame.
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