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an undergravel can be done but there are many better options available.
Yeah I found it a bit strange the pet shop recommended the undergravel filter.. I'm still not even sure what size of tank I'm gona get, I'm looking for a new house so that's gona determine that.. what size and set up do you use?

The size of the tank you get depends a lot on the type of expendable income you have. Bigger tanks go up exponentially in total cost of a system as well as the amount of money it takes to keep it maintained. Water changes, stocking the tank, and the equipment required increase drastically with the size of a tank.
Personally I would recommend a 75 gal or equivalent for a good starting point. I'm not a fan of narrow tanks.
Welcome to Reef2Reef.
29 gallon, deep sand bed, live rock, hang on back filter for media.
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40 gallon, sump, live rock, lit fuge with cheato, skimmer, media reactor.... This is a new setup
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The best advice I could give you is to plan on what kind of animals you want to keep and then work backwards from there. I.E. - I want a Powder Blue Tang. Now, you know what minimum size tank you need. You can figure out what other animals would be compatible with it, so on. Or I want to keep SPS corals. Now you know that you'll need good lighting and flow, so on.
Also, the best advice I could give you is to come up with your plan and then post it on here before you buy anything. Don't trust what a salesperson at an LFS tells you. Let the very knowledgeable people on here give you unbiased opinions on whether it's a good idea or not. This will save you a lot of money, time, and frustration. There are also others on here from Scotland that can stear you in the right direction.

