Clam lighting

[blacknife]

Both tanks are tied together. The twenty just holds fish and corals that don't play well in the other tank. survey says...

Find a purty clam and hope for the best.

[daniella3d]

It also depend on what type of bulb you have and the age of those bulb.

For exemple if half of these are actinic, then you only have 3 bulb that produce decent PAR. For clams I think you would need to have at least 4 bulb that produce a good PAR, maybe more.