Aro possible, aslong as it dont jump out, and the RTC or TSN would be better in a 1000g or bigger if you was to keep it long term, well more like 1500g +. grow dam quick 
Works for me.
I have a 500 gal intex, at first I was using it to overwinter koi, goldfish, Uruguayan cichlids, and water lilies.
It now houses 6 Madagascar cichlids.
I realize these are not monsters in the true sense of the word, but territorially, they have split it up with no room to spare.
I do have a couple heaters in it, and strategically place them over stone tiles.

Thx a lot duane. How big a abkve ground pool to start do u think?
Also, hkw many bichirs could I do?
Could you post a video Duanes?