If you have 2500 to play with. I'd recommend you have the tank made special. and obviously have a stand made for it that suits your decor.
theres a company in falkirk called boss that build tanks to your personal specification and drill it where needed.
Work out where the tanks gunna go, work out the size you want. work out the size of sump (they make them too) and possibly have a sperate refugium. the refugium needs 24 hour lighting so its best if its away from your sump which you dont want to have any lighting for (that is if you have seperate refugium)
take into account the cost of plumbing as well. Overflows can just use cheap pipe from b&q (make sure its pottable and has no metal fittings)
The pipe you pump up should be pressure pipe, its thicker.
If you have the stand made to measure, this will probably be the most expensive part.
since you have a large budget, you should do some serious planning. With 2500 I would build an uber system.
I'd start my planning with...
Main tank, as large as possible, space permitting.
Stand. Made of good strong timber, with two sections with doors.
Sump - large sump which tank overflows into.
Refugium in seperate cupboard in stand next to sump, sump overflowing into refugium using simple piping. External pump, pumping water back into tank. Refugium needs lighting, possibly some small T5s, using all marine whites, no need for actinics.
Man I could go on for hours about the planning I'd do if I had 2.5k to spend on a tank setup.....but I dont have 2.5k
::::: goes and sulks, decides to buy lottery ticket :::::
TAz
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