Looks like you have African cichlids? Usually plants aren't known to fair well with those, but if you want I'd suggest java fern or anubias nana, those worked ok for me when I had them.
I like a natural looking tank so I'd suggest rocks, you can find a link on this site about what kind you can use, wash thoroughly and with hot hot water. Otherwise u can purchase cichlid stones with holes, I face the holes towards the back or so u can't see them much to look more natural, u can see my pics under my profile. Or Texas holy rock works also!
Africans cichlids like harder water so u can add seashells, of course clean very well like I said above with the rocks. Shells help keep water hard also.
What size tank? Do you plan to keep current fish? What's in there?
It's a 40 gallon with 6 cichlids and plan to keep all. There's a pleco to but he's going to be re homed as he's getting to large and messy for a pretty filled tank. They're all still juveniles.
Yah I just set up a 90 gal and I'm so annoyed. I got used off craigslist and once I set up and filled w water an turned light on. There's tons of scratches. Looks like last kid cleaned it with sand paper!
IView attachment 217232 you can diy rock caves, these are in my african cichlid juvenile tank - just make sure whatever glue use to secure the rock is aquarium safe, and PVC pipe - I threw these together pretty quick - they could be a lot better with more effort.
Here are mine. 36 gallon w a ram dwarf and an apisto dwarf and tetras and Cory cats. Some slate cabes and fake plants and wood.
And my 90 gallon African mixed mbuna tank. With some river rock. Both have sand bottoms. And my old tank w some mixed rock and fake plants. What cichlids do you have? I don't think you'd need lots of rock like mine but some would be nice. View attachment 217240
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Uhm wow those are beautiful. Ok I'm switching to sand if I can find it around me. I have a snow cichlid two parrots and blue zebra and two purple things not sure of species!!! :/ I'm thinking sand, rock, fake plants that look real like yours and some wood too. That should help I want it to look natural