Aquaponic Gardening

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I am getting ready to add a 150 gallon outdoor system. Plan is to close it in eventually.  It will mainly consist of gravel beds and PVC runs.  My question, for temp reasons, should I have continuous flow through the PVC letting it drain into gravel beds to Bell siphon out;  or let the beds Bell siphon through the PVC giving the PVC an ebb and flow effect?  I have heard PVC water can get hotter than beds.  Love to hear from you.

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Uh, I would probably recommend a layout with a sump tank to make use of NFT runs because you need filtered water to go to the NFT.  And I wouldn't really recommend having the siphons dump into NFT runs because that may be like expecting your tender annuals to survive a flash flood several times an hour and if they do thrive and grow well, you may be in for overflowing NFT pipes whenever the siphons kick in.

So, I would recommend something more like this

You might also add a T and a Feed with a valve directly to the fish tank in case you need more flow through the fish tank and in case you ever want to take the NFT pipes offline.

I usually recommend at least 300 gallons for temperature stability especially in media, nft or tower systems.

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