green & red food coloring dropped into a fishbowl of cool water - light table as a backlight.
USM only. Shot RAW, but used the JPG. No crop. Some will not like the fishbowl revealed at the edges, however upon comparison to others without this added something I liked.
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Nice shot, but I'd crop out the edges of whatever was holding the liquid. Also some broad dodging on the edges to bring out the clash of whatever bloods there were (human/aliens or was it more complicated?). But I guess dodging would be against the rules...
4 - Like the effect, colors are good, but border slightly 'in between' the base 'schemes' mentioned for the Challenge. Perhaps a variation in crop/composition, tighter on the left, but not sure as does work well as is in my opinion also.