Drilled tank, hole diameter

Just bought a 150 gallon tank that has been drilled. It has two 3/4 inch holes one on each side. Are these going to be big enough to provide proper filtration. Or should I drill them out to 1 inch or bigger. Or plug and drill new.

 

bulk head size / hole size
1/2" / 1 1/8"
3/4" / 1 1/2"
1" / 1 3/4"
1 1/2' / 2 3/8"
2" / 3"
*for example a bulkhead fitted for a 1" pvc pipe requires a 1 3/4" hole.
* I'm so glad to see you drilling and can't understand why more people don't??


*funny, I just posted this on another thread last night-no tubes-no fuss and very quiet with no fear of flooding like a syphon box.

 

I just don't know if I should drill the existing holes out larger or plug and drill new.

 

Well that depends. For example I have for the intake holes, (i'll use my 150g) 1" pvc on either side/2 separate boxes for a total of 1200gph-600 per side. That should work for your 150. The return pump should be around there in the middle of it's flow rate. 3/4" like you have would be 330gph per side for a total of 660 which could work depending on what your stocking.

 

I think what he meant was, is it dangerous to drill out a bigger hole from an existing one? I'm not sure about the answer to this and would like to know as well.

 

I don't know the answer to that? I always have my LFS do the drilling, (in the past a glass store once) and never had to have a hole diameter increased, though to make the diameter smaller one could use a different bulk head than the standard ones.