Chili Rasbora behavioral and eating problems?

[Honem]

I just got my Chili Rasboras about two weeks ago for my 5.5 gallon heavily planted tank. They unfortunately had to stay in my 10 gallon with ADFs and neon tetras for about 4 days, but they have been in their actual tank for over a week now. It's been really hard to feed them due to their small size in the heavily planted tank, and it's almost impossible to find them all during feeding time (I didn't have this problem in the 10 gallon). I have 6 of them, and they almost never school together. The only time they'll come together is when they're 'playing' in the bubbles from my sponge filter. I have no idea what they're doing or why they're all crowded around the glass purposely coming back to get thrown around and lifted up by the bubbles (not trying to jump out or anything), but they get so distracted by this that I have to turn it off just so they'll get away from it for a second to feed. Even then, they don't eat. It's not the ammonia, and they ate just fine when they were in the 10 gallon. I have tried to feed them baby brine shrimp and crushed up fish flakes but they're never together so it's always just one of them up in the front eating all of it. Unlike with my neons, they don't come up when I tap the glass or when they see me coming, and I've already tried to feed them individually around the tank (they just swim right through it). Sometimes throughout the day I will see them all at the bottom picking for food around the substrate, and I've tried to feed them then but they still just swim right through it or pick it off the floor when it drops.

What is the best way to feed them? And I'm also really concerned about them swimming in the bubbles, because they do it for hours on end for seemingly no reason at all. There's not enough water for them to jump out, and they never even break the surface, but it still looks like some kind of behavioral problem. My shrimp liked to swim against the currents sometimes when I poured new water in, but I've never seen this in any other fish. It's either that or they're on the other side of the tank trying to swim right through the wall.

 

[WRWAquarium]

Hi

Such small fish might not really need much food or be finding micro organisms on the plants to eat?

I think I would trim back some of the plants if it is really that heavy. Could you post some pics?

 

[Honem]

Hi

Such small fish might not really need much food or be finding micro organisms on the plants to eat?

I think I would trim back some of the plants if it is really that heavy. Could you post some pics?

Thank you! It's also very hard to see them because they blend into the substrate so well, and the light is usually dim and the water has lots of tannins.

 

[WRWAquarium]

I see what you mean, I can only spot I think 2 of the rasboras in your pic haha

The aquarium looks very nice and I don't know if there are too many plants really. Would be a shame to remove a large amount of them.

I would give them more time to settle in before worrying too much. The bubble riding behaviour is somthing I've seen small fish do before too. That was with danios and I put it down to them being idiots. You could try a small hob filter instead of a sponge?