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ah, okay, I see. Your idea of totes is the best re $$. Would need an aeration pump/stones provided for each to make sure there's both movement and enough surface agitation to help with oxygen mixing. I don't think I'd bother with a filter unless something could be set up to service all of them as the cost might get prohibitive. Having some plants would help with the gf but prob not with the koi as the koi will probably eat them. Unless some screen/mesh was put around the roots (floaters). For the plants, you'd need some light, artificial or natural. And of course, feed sparingly. No doubt water changes will have to be done with such a small setup, but I'd never do more than 1/3 at a time, taking into account the possible chlorine/chloramine situation of the water source. If ONLY chlorine, a separate tub can be had to off-gas the chlorine for 24-48 hours. If the source has chloramines too, you'd need the anti-chlor from the pet supply.
The basic idea is as much volume as you can, minimize feeding, have plants to help filter (for the gf) and prob some sort of diy filter setup for the koi. And lots of water movement via an aerator or the filter pump.
As for a diy filter; I made one out of a 5 gallon pail once. You need basic plumbing parts to outlet the filter at the bottom through a connected hose. The pail can be filled with bio balls/plastic shreddings/lava rock for the bio part and placed on top of all that, some filter floss/mesh/sponge etc to catch the main debris (which would have to be cleaned regularly as it clogged). The water would then be pumped from the pond/tote, into the pail, flow through the filter media, and out through the outlet hose at the bottom and back into the pond/tote. Either have two outlets/+hoses at the bottom or one 'twice as large as the inlet hose'. For my purposes (I was housing turtles indoors) I had the tote INSIDE and over the tote/pool/pond just in case it clogged and overflowed. A kiddy pool is what I used and would recommend here, IF you can get one, as the volume and surface area would work in your favor. I have no idea how much space you actually have for this pool, but totes should be easy enough to find room for.
The largest problem imo, is too small a living area for too-large of a fish/fish load. The gf would be fine, and I'd stick with those unless you can get a larger pond some day.
Hope this helps at least a little bit.
Michael
The basic idea is as much volume as you can, minimize feeding, have plants to help filter (for the gf) and prob some sort of diy filter setup for the koi. And lots of water movement via an aerator or the filter pump.
As for a diy filter; I made one out of a 5 gallon pail once. You need basic plumbing parts to outlet the filter at the bottom through a connected hose. The pail can be filled with bio balls/plastic shreddings/lava rock for the bio part and placed on top of all that, some filter floss/mesh/sponge etc to catch the main debris (which would have to be cleaned regularly as it clogged). The water would then be pumped from the pond/tote, into the pail, flow through the filter media, and out through the outlet hose at the bottom and back into the pond/tote. Either have two outlets/+hoses at the bottom or one 'twice as large as the inlet hose'. For my purposes (I was housing turtles indoors) I had the tote INSIDE and over the tote/pool/pond just in case it clogged and overflowed. A kiddy pool is what I used and would recommend here, IF you can get one, as the volume and surface area would work in your favor. I have no idea how much space you actually have for this pool, but totes should be easy enough to find room for.
The largest problem imo, is too small a living area for too-large of a fish/fish load. The gf would be fine, and I'd stick with those unless you can get a larger pond some day.
Hope this helps at least a little bit.
Michael