I have not used photoshop elements before but I do use photoshop 6.0 regularly. Look along the top and click on "Image->Image Size". This should open a popup window where you can change the physical dimensions of the image. 550 or 600 pixels wide usually works well. After that click "File->Save for Web". This will compress the image for display on the web. Then save wherever you want. Like I said, i haven't used PS elements before, but I would assume that the basic functions are the same. Try it and let me know if that works for you.
As far as snails and crabs, the next time you are at the LFS grab a couple of astreas and maybe a couple of blue leg hermits or scarlets. Acclimate them to your tank and give them a week or so. If they are surviving reasonably well them get some more.
$150 for a 5 stage Ro/Di unit is not a bad deal. I paid more than that for my 4 stage unit. Do not get less than a 50 gpd unit. 100 gpd is better. A flush kit is recommended to lengthen the life of your RO membrane. I will sometimes get replacement prefilters and carbon block filters at my local Lowes or Home Depot which are usually moderately priced.
Most units are virtually the same. So go with the best price you can find for a comparable 4-5 stage 50-100gpd ro/di unit.
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