Waterbox overflow

[JulesH]

Hi all,

I have a 4ft lagoon reef tank that is approaching its third year. I have noticed I keep having issues with the balance between return pump and weir overflow. The weir on this tank is quite small, one thing I have noticed is an accumulation of coralline all the way across the lower end of the weir comb. This looks to be inhibiting the back flow to the sump.

The weir comb is not removable from this particular tank. I have tried brushing and using a dentist pick but I have not been able to remove much of the coralline, does anybody have any better ideas please?

 

[Rocks reef]

Are you able to scrap it off with a flat blade like a scraper or flat tip screwdriver? The dental tool should work quite well honestly. I use one to scrap coralline off all sorts of equipment in my tank.

 

[JulesH]

Thanks for getting back to me. Yes it has been tedious but it all off.

 

[Tangdora]

my last tank , a little 90 with built in overflowhad I had similar issue to clean out the slots I would use a 3 in stainless steel fine thread machine screw from the hard where store. Want a size that is the same size as each slot. But the threads act like filler/saw. If you match the size of each slot you can just saw up and down and flake off the coral line You don’t need to go fast or apply a lot of pressure