Best Kind of Holding Tank

[fishduded82]

Hey guys, I'm looking to put a holding tank in to age my water and to pump straight from for water changes. I have a few options at a local Tractor Supply:

This one is made from plastic and for use with water.
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or

This one I thought was plastic but turns out it's structural foam, whatever that is.
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or

This one is galvanized.
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So which one would be best? Or is there something else that would work better? I've been looking for a food grade holding tank but haven't been able to find anything smaller than 250 gallons. I'm looking for something around 100 gallons.

Any ideas?

[fishduded82]

Anybody have any idea?

[BIO-Linist]

Disclaimer: I have NO actual experience with stock tanks, but have considered (more like fantasized) before; they're made mainly for horses etc to drink from and people also use them for fish ponds.

Like the first one. Cheapest per gallon.

The second one looks stronger, which is good if you'll be moving it around.

The third one, not so, I wouldn't really trust galvanized, it might add zinc /metals to the water.

Also check to see if the plastic is treated with any mold/mildew preventive chemicals, if so it isn't good for fish.

[Sarkazmo]

I've seen ponds made from the first two but the galvanized is right out. Too much of a chance of it leaching.

Sark

EDIT: There's also the option of building your own 'tank' from wood and lining with a pond liner to make it water tight.

[fishduded82]

Thanks guys for the input. I went with the Rubbermaid one. The guy at TSC said it's made for livestock and will not leach any chemicals or contaminants and I thought it seemed sturdier. And was only $10 more.

Now just have to set up some kind of pump to get the water from the holding tank to the fish tanks. What's the best way to do it? With a submersed pump in the holding tank or an inline pump?

[korith]

Probably a lot smaller than you are looking for, but a lot of sw hobbyists in my area use those 50g brute garbage bins for aging and mixing their water. Know a few fw folks that use them as well. The bins have wheels on them as well.

Also start at looking at craigslist, may be able to find a large food grade drum there.