Thanks for all of your warm wishes.
Automation definitely does look like the way to go, but I think financially will be a little while away. I'll aim to get there in stages. I'll start with the mixing station. At present I'm using natural seawater, but the SG of it is quite high (1.028). I dilute it to 1.025 with RO/DI that I make at home. I have 2 x 220L (58 gallon) plastic barrels that I plan on plumbing up for RO/DI and mixed salt water. I'll then have hose run permanently from the barrels to the two tanks. I'll also run a drain from the tanks to outside. It will mean I'll no longer have to carry heavy buckets. I'll investigate the other options mentioned.
The auto water change stuff does have some concerns in my mind on failure modes of the different components. I have a major distrust of levels switches (use thousands of them at work of different types and have seen far too many failures). I'd hate to lose everything as the result of the failure of one of them.
@Edp251 Yes I agree on the type of corals kept. I've ended up trying to stick to mainly softies, xenia, mushrooms, zoas. There's still plenty of colour and movement with those.
My cubes are unfortunately close to 24" deep and while from a visual point of view this is great, from a pain and maintenance point of view it is not great. I'd certainly recommend a shallower tank of you have any range of movement or back issues.
@Buffalou I'm sorry to hear that you too are a chronic pain sufferer. Yes, I hear that SCS are not always what they make them out to be. I was trialling one of the DRG style ones which were supposedly greatly improved, but unfortunately it wasn't to be. I'm glad to hear that managed to get your motivation to come back from the tank crash. Is there a DIY page somewhere for how the litermeter pumps can be setup for auto water change? I'd like to see how they are doing it. Thanks for your wishes and all the best for your pain relief.
@WVNed I agree entirely. I get water everywhere... Unfortunately I don't have the room to move things around from where they are. I'd love a basement like a lot of US houses have and would put the sump down there in a heartbeat. Unfortunately my house is single story on a concrete slab. Keep fighting!
Shane