Suggested Powerhead Placement

I had a previous thread going here about some red algae growing in my tank. I found out it was Cyanobacteria. I scooped it all out and rearranged some stuff. Also, cleaned my filter pads quite well, and set everything back.

Now my issue is: how should I place my powerheads? I know I'll need more than what I have, but it's all I can afford at this very moment.

Current Layout:


I was hoping the two powerheads on the back wall would cause the current to pick up a little and wrap along the glass to the floor and cause current, but I don't know how well that will work for a long time. The powerhead on the left sweeps back and fourth but I don't think it's getting enough done as it doesn't stay in one spot long enough to cause a heavy stream and cyano can grow below it.

This is my next layout I was thinking about trying:


If I move the two stationary powerheads to the sides blowing towards the center, I'm hoping the streams can meet up and cause a current in the middle. I can put the third powerhead sideways and turn it so it points down and streams to the front of the tank and back.

I know I'll be getting another powerhead or so come tomorrow, but what do you think is the best positioning?

I would have the powerhead up just enough to not disturb the sand, but then would that cause a problem with surface movement? I do have two filters flowing...

Yea, I tried moving them around and all and after cleaning all that Cyanobacteria out it's starting to come back again. I know more LR will help with the sand disturbance but I don't know about now. I tried the layout I gave and all it did was blow the sand everywhere even when I set it towards the top. I know I need A LOT more LR but for now, it's what I can get. I was also thinking of changing from sand to something else, but I don't wanna go through all that lol. This is turning into a difficult task right now lol.

More advice yes? lol.

Right now that's my current setup. I have the black powerheads on opposite side walls and the rotating one on the back. It still blows my sand everywhere though. As for the cuc, instead I have a few Nassarius snails. I have 3 and I know I'm going to need a lot more but don't want to put them until I have more rock as to not crush them. Is there perhaps a sand vacuum I can use that won't suck upmy sand?

Edit: and the sand below the powerheads isn't getting touched so I know I'm going to need to do much more.

Not in the corners, but on opposite walls (left and right). The reason not in tue corners is it would get slowed down by the filter tubes and also the center power head.