Do you think one power head will be enough for a 75 gallon? also how long does it take for a tank to cycle or for your rock and sand to become live before you would want to put in fish corals and anemones?
I would do two. If you skimp on flow, you end up with more problems later then you solve. I have 3 powerheads in my 80g (plus flow from return pump). As corals grow, they block flow and you end up needing more. If there are dead spots then debris piles up and ugly algae.
Same with lighting. You don't need a $1000 fixture but nem's like light so you shouldn't go to minimum.
You can cycle your rock faster using a bacterial additive like Biospira. The tank may not be ready for nem's for a few months. First fish can go in sooner, days to a week or two. If you don't use Biospira and just cycle old school... expect 4-6 weeks for the tank to cycle.
Your biggest problem will likely be fish disease... it's just a problem in this hobby for new tanks in general. It stings to lose $$$$$$ in fish. Probably best to stick to hardy species and try to find a quality place to buy fish.
When money is a concern, the easiest way to cut cost is to go with a smaller tank.
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