i have a 70 litre tank all with heater filter sand substrate. theres plenty hiding space toys and soft plants. monday i bought 9 harlequins a pleco and a male betta blue with a discolouration of pinkish tail. all is well apart from that my betta wont eat anything apart from bloodworms, i have betta flakes and he wont come to the top of the tank for food only for the bloodworms and air. is this normal is he settling in the tank still. the water is fine the temperature is perfect and the filter is on low as theres to much current even o still strong current on low. but otherwise all the fish are fine my harlequins are eating like theyve never seen food before and my pleco is eating his wafers and algea fine. is this normal for the betta as i am a first time owner. please help