I guess there is no specific format, but you will need to change the format anyway to get it smaller in size(KB).
"GIF" is one of the smallest formats, you can use the "paint" program built in to Windows to change it, its kinda crude so you have to mess around. Otherwise there are some free programs that resize/ect.. you'll havve to search google.
10G,Planted- Endler's Livebearers+RCS, 55G,planted
Originally Posted by Kurt_Nelson
Understanding the basics will let you make informed decisions on what advice to follow, and what advice is just plain hooey!