Outdoor sump system

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Hi,
I am new to the forum, however have been keeping saltwater tanks on and off for twenty years. I have recently returned to the hobby to find a plethora of new techniques, equipment and theories! Having researched as much information as possible I have formed the following conclusion; Firstly I should state that I am from South Africa and do not have access to all the online ordering sources you guys have in the first world. As a result of this I have been an adherent of the "less technology more biology" approach to reef systems. The advantage we have is access to large outdoor areas, a tropical climate and flexible municipal laws.

I have been of the opinion that tank approaches are similar to the situation that car manufacturers find themselves in. You get the German/Japanese approach where a small engine is nursed and tuned to get the maximum output from it, and then there is the American way of simply putting a larger engine in it. I am of the larger engine school. Currently I am setting up a 1400l (400 gal) tank, however my opinion is that bigger is better. As a result I have plumbed my existing 1400l tank to my 400l sump and then I pump the water outside of the house to a 2500L tank with perspex covers and macro algae as well as a DSB. After circulating through this reservoir the water is returned to the display tank giving me an effective 4000L+ (1000 gal +) system.

What I would like to know is if there are any possible issues with this system such as sudden nutrient spikes etc. that anyone knows of. I have done an extensive online investigation without any results.
 
Upgrade to outside sump system

Upgrade to outside sump system

So I have upped the system a bit. Have added another 0.75Kw pump running the water in the outside sump in a closed loop through three koi pond sand filters filled one with rough silica sand, one with fine sand and one with shell grit. This then runs through two 50l biological canisters filled with coral gravel (hoping this will keep the calcium levels high) and from here it passes through an array of three 55w UV sterilizers and back into the holding tank. The display tank then contains an overflow which runs to a 600l sump below containing two large protein skimmers and additional DSB with heater compartments and into a return compartment. From here a 10 000 l/h DC pump sends the water outside to the main sump tank and is returned by gravity feed to the DT.
 
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