One of the additions I made was another bulkhead and whirlpool tube. After looking at others, I thought of that. Thanks for letting me know, I still feel like. I'm missing something. I'll also be doing a build thread on it soon.
People are testing little dc pumps from eBay right now. They are cheap and seem to get the job done. 18 or 22 bucks on eBay. i38 pump I think. There is another thread on them. For recirculating hlt they would be perfect and cheap.