KOSOVAR1  I just tried checked the developer's website and can find no reference to the new incompatibility problem for MA and MA Time, at least on the newest iMac models. I know it is incredibly naive of me to say that they should warn potential buyers on their website not to waste their money since their software apparently doesn't work anymore on the newest machines and/or Mac OS software, but that's just me.

I notified the developers by email, but I understand from others that customer support for this company is poor or non-existent. In my case, the developer has not had time to respond since I just posted my complaint.  
(Version 1.1.6)

KOSOVAR1  I just tried the most recent (but already ancient) version of Marine Aquarium on my new 24" iMac. It also refuses to load and the same message says to contact the developer. I have done that and we shall see if they respond, or better, fix their two aquarium screensaver products. This incompatibility problem also exists for MarineAquarium Time.  
(Version 1.1.6)

KOSOVAR1  I bought the newest iMac (early 2009) and installed MarineAquarium Time v. 1.1.6. I also just updated my OS to 10.5.7. I have owned Marine Aquarium and MA Time for years. Unfortunately, MA Time doesn't seem to work anymore on my new equipment (unk about MarineAquarium). A message pops up and says that this version of the screensaver doesn't work on this model of the Mac that I own and to contact the developer. My guess is that this screensaver will not be updated again for compatibility, since it hasn't been for such a very long time. Potential buyers should consider this, or at least install either or both screensavers as a demo first for testing. I wish the developer would prove me wrong about their not updating their product as it was always one of my favorites. If they DO fix it, I would also suggest increasing the resolution of the images, especially the coral rock background. On a 24" screen, it is looks unrealistically pixellated. On a 30" screen it must look worse.   
(Version 1.1.6)

ANONYMOUS  as a diver i have always enjoyed observing the aquadic life; (your) fish should / could clean / feed on the coral.....it's what they do...& it would be interesting & correct.

i enjoy your work very much!   
(Version 1.1.6)

FLARCH  I'm not surprised the local CompUSA uses SereneScreen aquariums to show off their monitors.

Very impressive and the recent interface changes, expecially with regard to the choice of fish, are great.

Best virtual aquarium ever.  
(Version 1.1.6)

ANONYMOUS  thank you!  
(Version 1.1.4rc2)