Beta one and only requests to lay at bottom of cistern and solely swims around every once and awhile 4 approximately 4 days, prob is?

its eating, but not much.
Answers:    More information is needed

Is the tank 2.5 gallons or greater?
Is the tank heated to around 78F - 80F?
Is near a slow flowing sponge filter?
Is the tank cleaned once - twice a week?
Is there a variety of foods?
How habitually do you feed your betta and how much?
Do you soak dried food before serving it to your Betta?
Have you checked the ammonia/nitrite/nitrate levels surrounded by your tank?
The water might be too cool??
What Kind Of Pseudotropheus would be best for me?   What should i nurture my betta? flakes or pellet? and where on earth do you get hold of live food close to bloodworms?   These fish for my 20 gallon reservoir?   Whys that fishes are not briny even though they live within the the deep river?