Agree with Tom, water testing is the way to determine if you have enough media or filtration, and do the proper amount of water changes.
If you notice any increase in ammonia it means you need more media and/or filtration.
But remember, filtration doesn't remove nitrate, only water changes are effective at its removal.
So if right after a water change your nitrate reads 5 ppm, but 3 days later it reads 30 ppm, it means you need to do a water change every 3, (or sooner) days instead of once per week. Or.....if the water from your tap has a pH of 7.5, but 3 days later the tank water pH has dropped to 6, this is also an indication that more frequent water changes are needed. (a drop means acidification)
If both pH and nitrate remain consistent, you water change schedule and volume are sufficient.
....none of your fish are full grown at the sizes you list, so although the new tank may appear empty today, in a few months with proper growth it might not seem so empty.
And as they grow the water change schedule and volume may need to change to accommodate the growth and increased metabolic byproduct production.
If you notice any increase in ammonia it means you need more media and/or filtration.
But remember, filtration doesn't remove nitrate, only water changes are effective at its removal.
So if right after a water change your nitrate reads 5 ppm, but 3 days later it reads 30 ppm, it means you need to do a water change every 3, (or sooner) days instead of once per week. Or.....if the water from your tap has a pH of 7.5, but 3 days later the tank water pH has dropped to 6, this is also an indication that more frequent water changes are needed. (a drop means acidification)
If both pH and nitrate remain consistent, you water change schedule and volume are sufficient.
....none of your fish are full grown at the sizes you list, so although the new tank may appear empty today, in a few months with proper growth it might not seem so empty.
And as they grow the water change schedule and volume may need to change to accommodate the growth and increased metabolic byproduct production.
