Welcome? What type of 29 gal? All in one (AIO) or a standard fish tank like an Aqueon? I have the latter.
Drop into the nano forum, the thread have great info specific to small tanks.
I have the CPR HOB (large) on my tank where I keep my heater, some rubble rock and grow cheato. I have not found a skimmer that fits inside the cpr. The hydor fits, the water level is sufficient for producing skim, but its below the out flow slots so I am not sure if the water is flow is optimal (I am drill a few holes to improve the flow.
The CPR uses a small pump so it doesn't skim the surface like a traditional weir on an overflow to a sump. not does it's design lend it to use filter socks. It's primarily a unit for biological filtration and not mechanical filtration
Nano tanks are perfectly fine with simply using some live rock and water changes.
Do your research on live rock. A nano wont break the budget with cured live rock (covered in coraline algae and other marine life). Arguably, It will help keep nuisance algae from settling in. The more common dry rock takes months/years to develop and mature.
The nano forum can help with lights, likely the biggest expense. I picked up the RapidLED Corona lights here for a bargain and love them on my 29. I have a review thread to which other members have contributed. Bit certainly there are many other options. Before the Coronas, I had them Fluval Marine LED unit. Very good spread, good lite for a nano. They get a bad rap here because they aren't high end lights and not powerful enough for much larger deeper tanks growing all sps. Also you don't have the flexibility to dial individual spectrums like the more expensive units. But it's questionable if a new reefer should be tinkering with spectrum or if they are better off with factory settings. In any case, the fluvals were did a great job of growing corals for me and saved me a lot of start up money until I was ready ti upgrade.
If you decide not to get a CPR HIOB fuge, consider a HOB skimmer. Real estate if a premium in a nano tank to be taken up by a large ugly skimmer.
I saw a member add an AIO unit to his tank. Basically an insert sump complete with an overflow, mechanical filtration, skimmer and small fuge for macro algae.
