"I only have 3 cichlids, 2 are yellow and the other one is blue. So thats 7 all together."
3 africans + 2 south american oscars = 5 cichlids
lol nice fish. i have had several electric yellows (you called them lighting yellow) and guess what... out of 5... i have one left, oscars find them delicious, and they cost me 17 dollars a piece, an expensive snack FYI.
also... those electrics, they are super territorial. mine goes after anything that comes near it.
what we really need to know for now, to help answer your question, is what is your ammonia, nitrate, and nitrite readings at right now??? also is your tank welll aerated? and what temperature do you have it running at? if your getting stale water your fish may be oxygen deprived. that might explain the hovering at the top of the tank. electrics are almost exclusive to the bottom of the tank. its unusual to see them at the top like you describe. either have a water problem (nitrates/nitrites/ammonia) because its not fully cycled, or theres not enough disolved oxygen in the water... or it could be quite simply they are scared of your oscar and dont have cover to hide behind? they do like caves

get us those water readings