Most of the time floaters are harmless. However, they can be a symptom of a tear in the retina. (The retina is the clear tissue at the back of your eye.) If you notice a sudden increase in floaters or if you see floaters along with flashes of light, this may be a symptom of a retinal tear or detachment.
Roblox is free to play, but to get Builders Club which gives you more features and perks as well as additional Robux you need to use real money to get them.
You can add as many cards to your ROBLOX account as you want. You'll see your ROBLOX Credit balance go up as you redeem more cards. You can then use this credit to purchase Robux or Builders Club. ROBLOX used to sell game cards at some retailers that redeemed for specific products such as several months of Builders Club or Robux.