My 55g Lake Malawi fry tank has gone green. HELP!!!!???!!

[Natedog]

Our 55g Lake Malawi fry tank has gone green and has a slight yellow tint to it. This popped up about 2 weeks ago. We started out by changing the carbon in the filter, then did 50% water changes twice a week, and finally took all the fish out and did a 100% water change. With the !00%WC we cleaned the filter, changed the carbon again and replaced the sponge. (Using an aquaclear70, we us aquaclear on all 10 of our tanks) The tank was deep cleaned filled, let run, and put fish in. The tank started with around 80 fry in it a month ago we have sold off all but maybe 15 1 inch fry. In almost 20 of keeping fish I have never, after all of that, had a tank go so dark green in only 2 days. None of my other tanks have turned green. What in the all holly heck is going on?

[rmalford]

Hmm... I'm interested and have now subscribed to this thread. Good luck!

[eklikewhoa]

algae spores/algae bloom

Ive read a lot about it but never had the pleasure of experiencing it but I would go with a black out period.

[jwh0818]

I had this happen once. A couple good water changes work and it is possible for this to happen during your tank cycle

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[Cheapomatic]

Do you have a uv sterilizer? It would clean that up quick! I sometime I see my LFS have some green algae bloom i don't think it harms the fish.

[TaTeR ToT]

If it gets bad enough it will choke out the oxygen supply. Especially at night.

[Natedog]

When in doubt go to your LFS and talk to that friend you have cultivated over many years and many $$. I up graded my lights to a 2 bulb T5. It came with the blue light for growing coral and made our fish look spectacular. The explanation I got was, "my white light has had time to degrade just enough for the blue light to really take over. Since it's a cichlid tank we don't have any plants in it and the blue light had nothing but the green algae spores to help grow." A water change or two and a black out time helped. We will be replacing the blue light with another white light asap to make sure this doesn't happen again, but in the mid-term we have cut the number of hours we keep the light on.

[eklikewhoa]

Any excess light will cause problems.

The "blue" bulb does not necessarily cause problems since a lot of people use actinics to bring out color.

[TaTeR ToT]

I would go with 12k t5 bulbs. The color they bring out is awesome. They are alittle on the bluish side, but still mostly white.