IMO, no those two skimmers are too weak, even combined, for 150g of water. But I am a fan of high skimming, so take that into consideration. I am also not a fan of those two particular skimmers, some of the worst on the market IMO.
It is possible to maintain a tank that size with those skimmers though, just not that easy. It depends on your bioload, frequency of water changes, and whether you run a macro algae fuge or not as well.
Adding 5 fish into 150g of water should not spike your ammonia and nitrite levels if your have a cycled tank with sufficient filtration. (rock, sand, skimmer)
I just added 9 fish to my 180 at once with no spike.
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