I've learned a valuable lesson here Dave, thanks.
I didn't know about the need to clean out the external filter regularly (I should have done of course, but it didn't occur to me). As you know I'm keeping my Eheim 2229 wet&dry unit, so I'll keep a regular eye on its cleanliness.
TBH, getting in on a regular basis and cleaning out/general husbandry gives one a sense of satisfaction that this is NOT plug and play, and that WE ARE needed there to keep things running in good order, otherwise it would feel like anyone can do it, and where would the pay off be with that?
Of course, it could be argued that with the DSR system (I think I got that right, Dutch chap's tank) that it CAN be automated and dosing pumps can do all the work, after all, he claims not to have done a water change in 10 years.
My MO and equipment will be this on my 155cm x 50cm x 40cm tank
TMC V2 iLumenaire 1200, plus 50w V2 iLumenaire compact for lighting
Get rid of trickle tower, space will be used by skimmer (not sure I'll bother using one)
Eheim 2229 wet&dry external with ehfisubstrat pro and bio mech, possibly some Lav if I have space (clean out regularly)
Sump filter changes/clean out each week
Good density of living rock in tank
1 1/2" sand bed
Hanna test kits where appropriate ( red sea pro nitrate test kit as Hanna don't do a nitrate kit), testing weekly.
one 5 gallon water change using RODI and salt to make up, weekly, my tank is about 67 gallons
Building ATS, this will go perhaps where trickle tower previously went.
Two Tunze 6055 units, linked for wave function
I will start posting photos as soon as I have the last of the rocks cleaned and the sand bed uniform, with lighting attached. You'll see a difference from that awful sart.