Inconsistent co2 levels is one primary cause of algae. The biggest challenge with DIY is maintaining a steady rate. It's best to have multiple bottles with staggered start times. Even on small tanks, two is better than one.
Im having good success with DIY on my 75 gallon using four 3 litre bottles, changing out two per week. I stay between 38 and 42 bubbles every ten seconds, or right at 4 bps. Also required is a leak free system and good diffusion. You can check my journal for more details on the set-up, pg 3 I believe.
Having said that, it sounds like you probably have a nutrient deficiency - another sure fire cause of algae. Flourish comp only contains micros, and "4-5 drops" a week is literally nothing for a tank that size. You need to be sure the plants are getting everything they need, both macros (N,P,K) and micros. Otherwise they stop growing and algae takes over.
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Last edited by burr740; 09-17-2014 at 04:15 AM.