DIY multi tank and sump setup

TKelm

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Hello everyone,

Although I have been looking around R2R a lot, this is my first post here so let me know if doing something wrong...

First of all I have not set up any aquarium by myself before, however have gotten to see and help with quite a few setups as my dad had multiple saltwater and freshwater tanks when I was younger and have some knowledge of the basics. This is my first rough plan and I'm very welcome to tips and changes :)

As the title states, I am planning to set up multiple saltwater tanks. My plan is to have them "cascade" and then get filtered by a very DIY sump. The setup is solely for keeping a few cone snails (the toxic kind) and 2-3 large sea urchins as part of my research project, so looks and silence of the setup are very much secondary. I have a large ~50 liter (14 ga) tank for the sea urchins and multiple ~20 liter (5-6 ga) tanks for the cone snails. I am currently planning to use two of the smaller tanks to keep certain snails apart, but with my plan that would hopefully be quite easy to adapt later on. Apart from a sandy bottom and a few small rocks for the cone snails there is nothing else planed to be put into the tank.

I want to avoid cutting the glass as these tanks might be used for something else. So, with optics not being important, the solution would be a simple siphon setup using PVC as done many times before.
PVC based overflow siphon



The water would flow from one tank into the next and in the end flow through a sump before returning. With the few animals I'm expecting a rather low bioload but I want to reduce the number of water changes I will need to make if possible.

Tank setup



For the sump I have the Idea to use left over 20 liter (5.5 ga) containers. They have a large opening on the top and a small threaded output near the bottom. Additionally they are shaped to be stacked, so I want to stack two (or three if necessary) to avoid a large footprint and tank costs. the containers will obviously be thoroughly cleaned before usage
20 liter (5.5 ga) container stacked containers bottom profile of container with dead volume 3-4 cm (1.5 inches) in height containers base is roughly 20 x 20 cm (8x8 inches) output is roughly 2-3 cm (1 inch) above the bottom


Based on some research I'm currently looking at setting up a rough mechanical filtration using a Foam followed by one or two layers of medium stacked between finer foam layers. the output of this would then go to the next container where it would flow over a simple algae turf scrubber before collecting with some GAC bags and getting pumped back into the tanks. Due to the low bioload and lack of corals I think I don't need a protein skimmer.
The containers have some dead volume below the outflow, giving debris the chance to collect and not getting into the next container / tanks. I'm not sure if this is an additional "filtration" or issue as debris might elevate certain chemical levels (nitrates etc.).
The additional benefit of such a modular design would be the easy way of taking everything out and giving it a good rinse when needed. I would have to vut the canisters open anyway to put stuff inside.
container based sump (bottom left graphic is lower container from the side, showing the v shaped double scrubber


let me know what you think and what I might need to change, or if this is a totally stupid idea to begin with.

Any advice is very much appreciated IMG_1733.jpeg
 

KrisReef

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Those containers are not really accesible for setting up (or changing) the filter media. Look at koi pond filters, and then get a Home Store large plastic storage bin with a lid to make a filter space you can access, no holes in the sides to leak, and put a sump pump in it for your return.

Those plastic jugs will likely leak if you modify them to access filter media.
 
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TKelm

TKelm

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Yeah my idea was to cut part of the top off and see how they structurally keep up with that. I'll try some stress test with cut containers and water as they are just laying around anyways.

I will have a look at some different storage bins to find something suitable in the meantime. Any idea how you would set up baffle like structures to direct the flow through the bin? Maybe look for a long and thin bin and just turn my planed setup to have the water flow horizontally?

Do you think the stages of the sump make sense or should i change the order / add something else to it?

Thanks a lot!
 

KrisReef

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Not sure what stores you have in your neighborhood, we have Lowes who sell these, cheap less than $10.00


The baffles to direct water flow are useful to direct flow through carbon or filtermesh, but otherwise they are option ime. Koi filters often have a brush area to slow water and drop silt out. Your tanks shouldn't be making a lot of dust or mud that needs to be settled, the brushes slow water flow to sink out silt and the bristles serve as sites for bacteria to grow for microbial filtration. Get creative and make a tray system to flow water horizonatally through media on the top, angled slightly to direct water to one side with the return pump working on the opposite side. Remember, this isn't rock science, the work is passive but assisted by flow.
 

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