I currently have a 35 hexagon tank with a fluval 405. I have had it running for over a year now and my coral seems to have a lifespan of about 1 month. 2 if I'm lucky. I have tested my water and my parameters are all where they should be. I have tested for everything. Salinity is at 1.025 and i have a kessel a350 light. I have tried just about every setting on the light. I have checked for predators in my tank and have none. the only fish i have are clownfish. I have crabs and snails but nothing that would kill coral. What i have noticed is my corals do not ever fully open up. I have only tried to keep the easy corals such as acans zooanthids frogspawns and stuff like that. Nothing complicated. Everything seems to die though. As you can probably guess this is extremely frustrating. The only thing i can think now is that my filter is made for a 70 gallon tank so maybe the flow is to high to maintain these corals? any help would be appreciated. thank you very much.