Blimey we are twins ! I used to keep and breed Discus many many years ago, more than I care to mention. Marine. well, this is a whole new ball game
As your experience will tell you having kept Discus it’s about the water and the parameters., Marine is the same except there are a lot more parameters and living organisms to take into account. You WILL make mistakes and you WILL experience problems but do not be deterred. Once you get it right you will have your own piece of the ocean in your houjsehold se. And believe me it’s fantastic watching it all come together from your CUC to your corals being nothing more than a spot to fully grown ti your fish pottering in and out of the rock
CUC take your pick from
Trochus, Cerith, money cowry snails,
Tuxedo, orange-spined & purple-tipped urchins,
Cerith, Nassarius, bumble bee, strawberry conch & fighting conch snails,
brittle stars (but not the green ones, which grow huge & eat fish).
Rocks & sand:
True blue leg hermits (too small to harm most snails) NOT electric blue-knuckled hermits which get too big & can kill snails.
Fire shrimp, blood ( whatever they call them are good to look at( except their natural instinct is to come out in the evening early morning mist of the day they will find a hiding place out of the way
(mine do) As for stocking you want a good selection of each, don’t go for the star fish straight away, they can be picky and difficult, that isn’t to say you can’t keep them but stick to the main stock . Turbo snaps are excellent as are the Narc which help to turn your sand around
Shops well the obvious ones are Abyss in Stockport and the old favourite Oasis but I tend to get my corals from other enthusiasts. One place that has just opened recently and has a fantastic selection of corals is Out of the Blue in Failsworth at the back of Housing Units
I wish you the best of luck, try to enjoy it and dio not get disheartened if things don’t go your way. Patience is the key with Marine’s