hello everbody, i have been keeping cichlids for a little over a year now. currently i have 1 55g for my JD alone, here he is if u would like to see him http://s1096.photobucket.com/albums...37/jefal/my%20JD/?action=view¤t=010.jpg .i would eventually like to pair him but first i want to get some experience breeding something easier. the first fish i ever kept were convicts. 1 was killed by my JD and i gave the other 2 away. i have 2 empty 20g high tanks and was thinking of using 1 of them for a convict pair. my questions for right now is would this be sufficient tank size for a convict pair, or should i pick up a 20 long or a 29g instead (funds are low), and also should i go with sand instead of gravel for a substrate? and also is sand harder to maintain than gravel? thank you to those of you that read through all of this and any other advice for tank setup is more than appreciated.