01-11-2013, 02:03 PM
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First piece of advice, is never, never buy a fish that will not be OK at its mature size in the tank you now have. All fish grow, continually, and they need sufficient space for this or they develop internal problems (when serious enough we call it stunting, but it can be trouble long before this stage) and this causes weakened immune systems, more health problems, sick fish, and shortened lifespan. Plans for a larger tank may not come to fruition, and someone who says they will take the fish down the road may not for whatever reason. The fish deserves better care, as I am sure you would agree.
Second, your 75g gives you several options for fish, but not all fish manage together so this needs thinking through before you start. And here I will point you to our profiles, second heading from the left in the blue bar across the top of the page. Minimum tank sizes, minimum Numbers for shoaling fish, compatibility issues, water parameter needs, etc are included for each species. If the name is the same in a post as in the profile, it shades to form a direct link to that profile, as some of the names did previously. If you check the profiles for the fish named, you will note that some of them will significantly restrict other types of fish due to their behaviours, even if space were available.
Third, cichlids are suitable, depending upon the species. Here you can go with African rift lake fish, if you have hard basic water. Or some Central American if the water is medium hard and somewhat basic. Or South American if soft and slightly acidic. So knowing your tap water parameters, namely GH (hardness) and pH is a first step. This applies to any fish obviously, as some have specific needs.