hello recently bough a juwel rio 240 litre tank and was wondering what would be the maxium ammount of malawi cichilds i could put in it , i kept a 190 lite tank for 10 years with coumminty fish, barbs, silver dollars, platties etc but with the new rio tank i just want the 1 species in so how many cihilds do you recomend ive a few rocks/plastic plants/sand in the tank