They're just two aqualife T5s. I bought the one on the front shorter than the one on the back because of the bowfront. Two 36" wouldn't fit so I bought a 24" for the front. Thanks, the HA is disappearing fast. I have pictures of the crash and it's not pretty. Can't wait for the coraline to take over completely. I've been seeing threads where people have trouble getting their coraline to spread but mines just spreading fine. Good indications.