Drilled hole 170 Litre tank 100 Litre sump
Do i require a external or internal surface skimmer if i have my tank drilled.
or can i just insert a 90 degree pipe into bulkhead fitting that goes straight to my sump. also have fluval 405 as a backup and filtration
in sump have redsea berlin classic skimmer with eiham 1103 and eiham 1000 return pump.