Betta Laying On It's Side?

I've never seen him do it until today. I added a live plant for him to sit on and he was kind of in it. Like Specs was laying on his side, on top of it, with his head in the plant.
Until I added the plant his light had been off. Ever since though, he swims around fine. Is eating fine. But he'll lay on his side on the plant or, I just saw, him laying on his side but floating at the top. Sometimes he swims at like a diagonal instead of vertical. But not seeming to struggle to swim.
He's in a five gallon, heated and filtered aquarium. Set up back in march with established media and water. I just did a water change of a little less than two gallons a couple days ago. He also has two nerite snail friends. This is a new thing, he was not doing it yesterday.
To be fair, he is a Walmart Betta, which I've had since about August. So I don't have high hopes for him to live forever, but I do want him to live as long as he can.
I'll add a picture of the plant in a moment, I want to get some answers as soon as I can....

Here are some pictures of his tank.... The green plant is the one I just added... But I don't see why it would have caused this... In the first picture you can kinda see him behind the filter intake.

 

Can you please answer the following questions.

How big is the tank?
Has it got a heater? What is it set to?
Has it got a filter?
How strong is the current?
Is it cycled?
How often do you change water?
How much water do you change?
Do you vacuum the substrate?
What additives or chemicals do you use? Eg De Chlorinator?
Do you use tap or bottled water? If bottled water please give us the brand.
Do you have a water test kit?
Can you tell us the readings for ammonia, nitrite and nitrate?
When you clean the tank can you tell us exactly what you do.
What do you feed him? how much? how often?
Any tank mates? What sort how many?
How long have you had the Betta?
Has he got a history of illness?
Any plants or decorations? Please give details?
Can you provide a close up photo of the fish?
Can you provide a photo of the tank?

 

How big is the tank? Standard five gallon
Has it got a heater? What is it set to? Yes, 78F
Has it got a filter? Yes, Aquaclear 20
How strong is the current? Lowest setting
Is it cycled? Yes
How often do you change water? Refill every few days, water change once a week.
How much water do you change? Usually 1 1/2 to 2 gallons.
Do you vacuum the substrate? Any debris off the top.
What additives or chemicals do you use? Eg De Chlorinator? Prime, occasionally stress coat.
Do you use tap or bottled water? If bottled water please give us the brand. Treated tap.
Do you have a water test kit? Yes.
Can you tell us the readings for ammonia, nitrite and nitrate? 0, or not a lot. The color didn't change noticeably.
When you clean the tank can you tell us exactly what you do. Cleaned debris off the gravel and drained a little shy of two gallons. Then replaced it with Prime treated tap water.
What do you feed him? how much? how often? Betta flakes. A tiny pinch. Twice a day, morning and night.
Any tank mates? What sort how many? 2, a horned nerite and a Tiger nerite.
How long have you had the Betta? Since August 2018.
Has he got a history of illness? No. None.
Any plants or decorations? Please give details? A chunk of live rock, a betta log, a moss ball and a live plant.
Can you provide a close up photo of the fish? I have never been able to get a good photo of him. But there is no outward sign of sickness.
Can you provide a photo of the tank View original post.[/QUOTE]

 

Hi, if he's healthy, a good shape, eating and swimming fine then he's probably just resting.
I see my betta in some quite amusing positions, he uses his fins to anchor himself against any flow and just let's the water wash over his gills I guess.
He never stays lying down in the same place for long periods and I have plenty of places he can go to get out of the flow completely.
So I'd say it's probably normal but if it still seems wrong then a video or some pics would help

 

I've just never seen him sit or rest like that. But as soon as I lift the hood to check on him he'll get up and swim around like nothing happened. Usually he "sits" on his bottom fin so it scared me to see him on his side. Then on his side floating behind the heater. Then floating on his side under the filter. But if I move anything he'll straight up and swim around like normal (or diagonal).
So I figured I'd post and see if maybe he was sick or old age or just him being weird. I'd rather ask a dumb question than something bad happen I could have prevented.

When he was laying on the plant, I literally thought he was dead. I couldn't see his fins or gills moving. Then I touch the hood and he swims out and looks at me. Gave me a scare.

 

Normal

 

View attachment 527137
Normal

Oh wow! Though if he lays on the plant like the way he was, I'll take a picture and post it. Because he *looked* dead