Hi guys thanks for replying.. Slayer213 - yep u r right and that whats i m planning on..and i agree with u there is no way i can sync both the flows with just siphon..so i am getting an overflow box. acidjc - i won't be able to change the tank any time soon. i need to see some success before i could investing in a tank again. and i did not over stock..i only bought what the guy i was paying for maintenance recommended. but i couldn't afford them after 2 months as it was $125 per week. and even they couldn't keep the corals alive and just shut me up with replacing them in beginning.. and i know the flood is inevitable but with right piping and regular checks i think i ll lower the chances as much as possible. also i m investing in water sensors just incase the flood comes. On other note...guess what!! last night i managed to catch both the mantis...ok this is how is caught them...get purified water and add as much ice as u can in it..but keep the ice in the plastic and don't let it melt and mix in the purified water...u will need very very cold water... then just take the rock and dip it and the mantis will come right out... I am adding them on pasar malam for sale.. need money for overflow box..