In expanded form that would be 10,000,000 + 6,000,000 + 100,000 + 7,000 + 300 + 20
Answer:
A good rule is to change 10 to 15 percent of the water each week. If your tank is heavily stocked, bump that up to 20 percent each week. A lightly stocked aquarium can maybe get by for two to four weeks, but this should be the maximum length of time between water changes.
Step-by-step explanation:
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Answer:
3
Step-by-step explanation:
Hard to see but pretty sure thats it
