100 gal tank with home made sump  900 gph pump system is 4 months old with rock and water added from other tanks that have been in operation for 2 years.  I am almost 99% shure that tank is cycled. Lighting might be only other factor.  After talking with friend he told me a quicker way to break the cycle is to leave lights on for 3 days or more.  I guess Ick don't hatch in the day so eggs die after a few days.  So I decided to try this.  But lighting is only a 40 watt t5 and has been on for only 24 hours.  Really don't think that this is it.   

Questions

1. Do you think malachite green had any thing to do with spike?

2. If so will water change bring back into alinement?

3. Should I expect to see another spike? 

4. What % water should I change out?

I know I should have a hospital tank but new tank and trying to get it up and running before investing in hospital tank.  I know it is not that much and should have gotten it but I guess this is just another dumb mistake. 

love thy wife then thy pets