I honestly don't think there is anything new in my system other than lamp replacements, PVC pipe and mag floats...lol.
Tank - Used
Stand - DIY with some reclaimed wood
Sump - used (Baffle glass and acrylic was used too)
Return Pumps - Used
Closed Loop Pump - Reconditioned
Loc-Line - Used
Skimmer - Used
T-5 Retro Kit - Used
Evo 120W LED - Used
Apex Kit - Used
When I upgraded from my 75G to the 125G, the only equipment I brought over to the new setup was the T-5 Retro kit. With that included my 125G build was still under $1,250 and may have even come in under $1,000. I then turned around and sold a complete 75G system with custom oak (real red oak) stand for $450 so the upgrade really didn't cost me much at all. When I upgraded to the Apex, I bought it for $250 and sold my AC3 for $125 so I made out good on that deal as well.
So yes, you sure can save money on this hobby. The expensive stuff is when you initially get into the hobby. Once you have the equipment the rest is easy.
Other ways to save money:
* Buy captive grown frags from other local reefers (Save on the shipping cost and typically locals get things cheaper)
* Sell coral frags locally to shave off on the costs of supplements and salt.
* Use controller programming to limit the use of the heater and coolers unless they are really needed (Leave a little temp wiggle room)
* Make your own fish food with items from the Asian market (I have been doing this for years and can feed my tank for 6 months on $50)
* Perform regular maintenance on equipment (Many people don't realize the preventable equipment failures are typically caused by poor maintenance)