Cheers Hannah, both photo's were in Sharm, the anemonefish was diving, the eels snorkelling.
Is it the ixus 95IS you have, I can't find a 9515.
If so, it may not be the ideal camera, as it just appears to use auto modes, which, while can work underwater, are not ideal.
Discussions abound on whether you need a camera that shoots RAW or not. Personally, if you're going below 10 metres to shoot, I'd suggest it is a must have feature, due to the colour loss. If your camera has a manual white balance then you may be able to get round the 'blue' issues using a diving slate to manually balnce. You just need to be aware that this needs to be done every couple of metres.
Best results are undoubtedly obtained with artificial light, but this can be where it gets expensive. Strobes to look out for would be from inon, with their S-2000 the cheapest followed by the D-2000. Both are very capable units and don't let their position at the lower end of the price range bother you - they are top notch.
Sea and Sea also produce good strobes. In the current range the cheapest ones are the YS-01 and YS-02, which are the same units apart from the 02 is manual only, whereas the 01can do s-ttl. Older units include the YS-110 and YS-90 which are worth a look at on the
second hand market.
Cheaper yet are strobes from Epoque and Fuji. When you look at the GN's remember that underwater they will only provide around 1/3rd or 1/2 of the power quoted as they are quoted in figures tested above water.
Ikelite is another manufacturer, but only the AF35 would be useful, as the others dont easily use fibre optic firing.
Regarding fibre optics, this will be you best method of firing a strobe with a compact camera. In addition, to the actual strobe, you will need a tray, arm and fibre optic cord.
To be honest, you'll struggle to get a new complete strobe setup along with housing for £500 new. The best deal I've seen doing a quick check is for a YS-01 setup from Bristol cameras at £489.
If you want to stick with the 95IS, then you can get new housings off ebay for around £150, but if it was me, I'd look for a used camera, something like a S90 / S95 along with a used strobe. That would give you manual control, RAW, and an external strobe which would be very good for medium sized fish like parrotfish, and very useful for slower moving stuff such as Morays in their holes, as well as scorpionfish, nudibranchs etc, hopefully for somewhere around your budget.
Either that or rent a setup - I've used divelife in Manchester in the past, there may well be other places renting gear out.
Mike