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algae wise, it was a back and forth problem. i put in a snail who took care of most of it, up until one of his fish buddies decided they had enough of his jive talk and ate him.
during a move, i decided i'd pull it out and replace it with something new. what was interesting is that as soon as it was out in the air, the tripod collapsed - as in all out destruction. clutch power of the bricks was shot. i thought it might be algae, but even after a soak and a scrub, the parts are decidedly no longer viable for a standing display. our club had an alien invasion display coming up, so that tripod ended up being one that had been taken down by the resistance, but i ended up chucking the parts afterwards.
For Lego less so :)
@Aleydita is on the right track. Get bluish lights and fake the water.
one other item of note, is that cleaning the tank itself became a bit of a chore - trying to suck the leftovers out without completely destroying the tripod itself.
Also, you need to make sure the air is out from inside the pieces to reduce the buoyancy.
Then nothing should happen to the ABS, and the other types of plastics from which Lego is made, as Lego decrapitation must be prevented at all costs of course.
Any chemists in the house who can confirm or falsify this?