Thank you for getting back to me, sorry for late reply, thread was quiet awhile and I forgot to check while balls deep in the build lol. I've ended up passing on the 60 litre display with 40 litre sump and a HOB overflow. Instead I've picked up a 74 litre/20 gallon display that has a hole drilled and came with the (wrong) plumbing. I've DIY'd an internal overflow box/weir, fitted a stand pipe with a durso, and a bulkhead. I have this with a 95 litre/25 gallon sump and the SiccI syncra 0.5 700 lph return pump. Silicon is now dry so transferring sand, rock, water, and hitchhikers tomorrow - I've been keeping them going with heat and an air pump in the meantime, i.e. the last 3 weeks. I'm planning a pair of clowns and some CUC for this tank, maybe another fish or two that will do ok with clowns and in that size tank, looking for recommendation there. I would like to try bubble anemones but have also been told hammer and frogspawn corals might be better. Either way I'll need a skimmer.Need of a skimmer depends on what you have or plan to have in the tank, so with that said, what is the stock of the tank going to be?
Yeah, definitely need a skimmer with corals