Sorry for being so late, but I certainly would recommend a couple of changes, number one issue is snails always try and run for the drain either place a strainer over the top or use an overflow or both!
If it were my tank I'd run a bean animal type drain with a coast to coast overflow. It looks complicated but is actually quite simple to DIY.
Another option would be to run your return behind the tank and use the 3/4" hole as a herbie type syphon (still leaves you drilling another hole for the open top concept). That will give you the added protection you need and reduce the noise. You could also increase the diameter of your return pipe which will increase the flow for your pump. Use the RC headloss calculator. The bean animal will take some time, but the herbie will be very quick and easy to plumb.
Use the locline above the water and don't worry about drilling it or using a checkvalve.
Don't worry about the level it is within an acceptable range.
Also a closed loop is a much better system than powerheads especially if you want to have anemones. I'd look into getting an external pump drilling another hole in the back.
What is your complete flow plan? and what do you intend to keep in the tank? Like you said better to get the plumbing right in the beginning so you don't have to change it later!
If it were my tank I'd run a bean animal type drain with a coast to coast overflow. It looks complicated but is actually quite simple to DIY.
Another option would be to run your return behind the tank and use the 3/4" hole as a herbie type syphon (still leaves you drilling another hole for the open top concept). That will give you the added protection you need and reduce the noise. You could also increase the diameter of your return pipe which will increase the flow for your pump. Use the RC headloss calculator. The bean animal will take some time, but the herbie will be very quick and easy to plumb.
Use the locline above the water and don't worry about drilling it or using a checkvalve.
Don't worry about the level it is within an acceptable range.
Also a closed loop is a much better system than powerheads especially if you want to have anemones. I'd look into getting an external pump drilling another hole in the back.
What is your complete flow plan? and what do you intend to keep in the tank? Like you said better to get the plumbing right in the beginning so you don't have to change it later!