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Interesting to me, as I’m planning to set up my first tank this winter.
I’d also like to hear how much people typically spend on established tanks, on a regular basis. Idk if $/gal makes sense, but of course to be useful, price info like that has to somehow be connected to tank size, the way this assumed a constant tank size.
I’m planning to build a tank that’s around 50 gallons, with soft coral :not designer, but sustainably grown, not wild harvested), anemones, and a clean-up crew. I want it to be as much of a closed system as possible. I’ve been reading about tumbler currents and jellyfish being kept with other animals, so I plan to set up that kind of current (not laminar flow/ Kreisel current) with very low flow. Eventually, I’d love to add jellies, but I assume it will be a couple years until I have everything set up and stabilized. For now, the idea of jellies is just a guide to how to proceed with the build—water flow, no corners, etc. I don’t have a big budget, which might mean even slower progress.
I have a 60 gallon SPS/LPS tank, so your cost should be lower. Here is what I spend:
Annually change 4 T5 bulbs = $80 (ATI)
Annual salt costs =$130 (10 gallons changed weekly, I use Instant Ocean)
Annual two-part costs =$60 (ESV)
Annual GFO = $40 (BRS)
Annual carbon = $20 (BRS)
Annual electricity =$240
Annual food = $20
Annual testing = $40
Bleach, Vinegar, other miscellaneous, annually = $30
Total annual expenses = $660
Everything here except electricity is a very accurate cost accounting, while electricity is more of a guess.
This is for ongoing operating costs only, obviously. If you are going to constantly change equipment and kill livestock, the hobby will become much more expensive. Try to avoid that...it's not necessary
One last thing, but costs do not seem to scale in a linear fashion, i.e. you can't multiply these costs by 2 for a 120 gallon tank. Most of these costs will scale linearly, but some might have economies of scale. It will also depend a lot on what you stock. For your softy tank, you don't need powerful lighting at all or as much two-part, as an example. Or if you have space for a refugium (I wish), you might not need GFO, but you will need another light.
If I bought this all at an LFS, they might be lucky to have an annual gross profit off of me of $97.50 - that assumes 25% gross margin on retail purchases of $390 (all of the above minus electricity and miscellaneous).
Of course gross profit is before all of their overhead, like rent, wages, electricity, taxes, etc.
Does anyone wonder why these LFS are going out of business and why their livestock costs are so high? Give them a break!