These are freshwater. However, I ran mine in a rift lake setup with Tropheus and Gibberosa. The water parameters were alkaline via aragonite rice gravel and bulk limestone. And, I used rift lake salt (calcium chloride instead of marine sodium chloride). My tigers seemed to enjoy those conditions.
Keep lots of plant material in the tank for them to graze on. I was constantly refilling veggie clips with cabbage, root veggie tops, celery tops, spinach, etc. They also enjoyed thawed frozen peas, fresh peas, or canned peas. Spirulina wafers/sticks/flakes are also readily taken. They also seemed to prefer earthworm sticks.
Don't try to keep any live or plastic plants in their tank. Real or fake will be equally chewed up. I grew anacharis plants in outdoor kiddie pools and would place a banded bunch in their tank for them to chew down to bare stalks.