First ever tank build- 75 gallon future reef tank

[Spongebob20]

Hey guys, just wanted to introduce myself to the site by sharing my first ever saltwater tank build (nothing too crazy). I've had freshwater tanks for the past 10 years and always wanted to venture into saltwater. Here's the timeline of my saltwater journey!

Week 1: Spent purely reading and doing research on this site, reading all of the recommended threads for noobies, making sure I understood it all, new what to expect, etc and had a plan formulated for setting up a tank.

Week 2: Found a tank and all necessary equipment, used online, and for an absolute steal of a price. Spent the week cleaning the equipment, repainting the stand, cleaning the tank, getting it set up in my living room etc. Then I added the rock, got it set up how I wanted it, added sand and water.

Week 3: Let the tank sit, got the salinity to a constant 1.025, temp at a constant 80. Nitrate and Nitrite at 0.

Week 4: Let the tank sit for half of the week, making sure all the levels of everything stayed constant and within desired ranges. Mid way through the week I brought a water sample to my LFS. They assured me I was ready for a couple damsels.

Now (end of week 4) : Damsels have been in the tank for 4 days and are doing great, eating normal and disease free. Tank seems to be mid-cycle. Waiting patiently until cycle finishes to add more fish. No major problems (at least that I'm aware of).

Some info about the tank:

-75 gallon
-CF 500 Aquatop canister filter with UV sterilizer
-AquaC remora hang on skimmer
-"48" T5 HO Odyssea light fixture
-2 powerheads (not sure what type)

Some IMPORTANT notes about the tank:

-About 100 pounds or so of dry live rock which came with the tank and all the equipment but had been out of water for several months
-About 5-10 pounds of live rock from the LFS which I am using to make the rest of the dry rock "live" again
*Figured I might as well use the 100 pounds of dry rock since it came with the tank and equipment.

-The water in the tank, unfortunately is TAP water treated with Dechlor. My RO/DI unit is arriving tomorrow and I will be doing aggressive water changes to get rid of the tap water. I am also currently using 2 heaters because they are both rated for a max of 30 gallons, but I have a 300 watt heater coming in the mail with the RO/Di.

I'd love to get some feedback about what I am doing right and wrong, what problems anyone might see with the tank down the road, and any general opinions. I am VERY open to constructive criticism and will not get upset if I'm told I am doing something wrong. My vision for the tank is to begin to add corals in a few months, maybe some simple simple corals in a couple weeks. Let me know your guy's thoughts!

[Sk8r]

Don't push it too far. You didn't mention quarantine for the damsels, nor their species...do. Most damsel species will require a hundred gallons. I hope you have the small species that will take to that smaller area. Damsels, be they clowns, chromis, or other types including dascyllus, will often take down their numbers until they think the space is enough, and four is a lot for a 75. They may also resent any non-damsel that arrives in what they think is now their tank. Some damsel species are more territorial than others, and you do not have much room for any more fish.

[Spongebob20]

Thanks Sk8r... The damsels are yellow bellies/ yellow tails. I was told they were the least aggressive and didn't get as big. Originally tr lfs recommended getting 6 of them but even I could tell that was ridiculous. One of them was getting beat up so I took him out this morning and he was adopted by a friend (much more experienced with saltwater than myself). Now everything is peaceful in the tank. I wasn't planning on adding any more fish for a couple weeks. Any recommendations for fish to add? I was thinking a pair of clowns. Once some algae starts to show up and the tank cycles I'm going to get a CUC. Don't worry, I'll be patient with it and leave the tank as is for a while.